There are gauges on your diesel that should never have come stock — EGTs you can't see, boost numbers you have to guess at, transmission temps that only show up when something's wrong. And there's tuning your factory ECU was never going to do for you. The Edge CTS3 solves both problems with one device, and it's the reason this gauge-and-tuner combo has been bolted to a generation of diesel dashboards.

If you've ever wondered why every clean tow rig at the truck show has the same color screen glowing on the A-pillar, this is why. Here's the straight story on what the Edge CTS3 actually is, how the lineup breaks down (Evolution vs Insight), what it does and doesn't do, and which version you actually want. Want it bundled with the rest of your build? Send us your specs.

What is the Edge CTS3?

The Edge CTS3 is a touch-screen display that does two jobs at once: it's a serious in-cab monitor for every PID your truck's OBD-II port can serve up, and on the Evolution variant, it's a tuner that flashes power-adding programs into your ECU. One device, two superpowers, on a 5-inch color touchscreen that doesn't look like it came out of 2008.

Edge has been making diesel programmers since before the term "tuner" meant much in the truck space. The CTS3 is the third-generation evolution of their flagship color-touchscreen device — better processor, sharper screen, faster updates, and a software ecosystem that's matured into one of the best in the diesel aftermarket.

The Edge CTS3 lineup: Evolution vs Insight

The first decision when shopping CTS3 is which version. There are two main variants and they do different things:

Edge Evolution CTS3

The full deal — monitor plus tuner. The Evolution flashes Edge's pre-engineered power tunes into your ECU (typically multiple power levels you switch between) AND gives you the full color-screen gauge experience. This is what you want if you've ever thought, "I want my truck to make more power AND I want to actually see what it's doing." Most owners buying their first Edge product land here. Browse it in our Edge Products collection.

Edge Insight CTS3

The monitor-only version. Same hardware, same screen, all the gauges and PIDs and customization — but no tuning. If you're running another tuner (EZ Lynk, Banks, an Edge Juice With Attitude module, etc.) and you just want the world-class monitor side of the CTS3 without the tune-flashing capability, this is the one. Insight is also the right pick on platforms or with tunes where you don't want to mess with the ECU at all.

How to pick between them

Quick decision:

• You want gauges AND power: Evolution CTS3.
• You already have a tuner you like and you just need monitoring: Insight CTS3.
• You want the simplest in-cab monitor without the tuning conversation: Insight CTS3.
• You want a layered system (Edge module + monitoring): Run Insight CTS3 with a Juice With Attitude or other Edge in-line module.

For most owners shopping their first device, Evolution is the natural choice. For owners who've already committed to a different tuner (a popular path on later platforms), Insight is the right tool.

The monitor side: what it actually shows you

This is where the CTS3 earns its place on the dash even for owners who aren't tuning. The monitor reads any PID your truck's ECU is publishing on the OBD-II bus and displays it on a fully customizable, color-coded gauge layout. You decide what matters. You decide what triggers a warning.

The PIDs that actually save trucks:

• EGT (Exhaust Gas Temperature) — the single most important diesel-tuning gauge. Watch it on every grade you tow.
• Boost pressure — your turbo telling you whether it's awake.
• Transmission temperature — the silent killer of automatics. Catch it before you cook the trans.
• Rail / fuel pressure — early warning of CP4 or supply trouble.
• Coolant temp — beyond just the dummy light in the gauge cluster.
• Intake air temp — heat soak in the engine bay, real intake temps under load.
• Boost vs fueling deltas — for serious diagnostic depth.

You can configure preset gauge layouts (one for daily, one for towing, one for racing), trigger custom alerts and shutoffs at user-defined thresholds, and log all of it for later review. The data-logging side alone is worth the price of entry for any owner serious about understanding their truck.

The tuning side (Evolution only)

Edge's tuning programs have been engineered for years and refined across countless customer trucks. The Evolution CTS3 ships with multiple pre-engineered power levels you can flash in seconds and switch between with a touch. Typical lineup:

• Towing tune — emphasis on torque, transmission temperature management, and EGT control.
• Daily / mileage tune — balanced for normal driving.
• Performance tune — power-forward, the one you grin while driving.
• Race tune (where applicable) — maximum power, race-only contexts.

The tunes are engineered to be safe within stock supporting hardware — that is, they're not asking your factory fuel system to do things it can't do. That matters because the diesel aftermarket has a long history of sketchy tunes that broke trucks; Edge's tunes are calibrated against real-world durability. You don't have to trust an internet stranger's calibration.

The CTS3 platform by platform

Ram 6.7 Cummins

The Cummins is where Edge has the deepest history. The Evolution CTS3 covers a wide year range with platform-tuned calibrations, and the monitor side reads the rich PID set Cummins ECUs expose. Pair it with the rest of the build — the 6.7 Cummins first 5 upgrades roadmap shows where tuning fits — and you've got a tow rig with brains.

Ford 6.7 Power Stroke

Edge is one of the names with the deepest Power Stroke tuning history (going back to the 6.0 and 7.3 days). The 6.7 PSD Evolution CTS3 is a strong choice for owners who want a single device for monitoring and tuning. Browse the rest of the Power Stroke parts.

GM L5P Duramax (and earlier)

The L5P specifically has been a more complicated tuning landscape due to GM's locked ECU history. Edge has navigated that and the Insight CTS3 monitor is universally applicable on Duramax trucks; tuner options have varied by year. Confirm the specific tuner support for your year on the product page or via the quote page.

Edge in context: where it fits next to the other names

The tuner-and-monitor space has a few major names and they each have their strengths.

• Edge — best gauge experience, mature tuning, broad platform coverage. The right pick for owners who want the integrated tune-and-monitor experience.
• EZ Lynk Auto Agent 3 — most flexible tuning platform with custom tune support; the choice when you're working with a specific tuner. (More in our upcoming EZ Lynk guide.)
• Banks Derringer / iDash — the choice when you want the Banks ecosystem and integrated hardware (intake, exhaust, etc.). See our Banks Power guide.
• SCT / Bullydog — historically deep but Edge has eaten a lot of their market share with the CTS3.

For most owners shopping a tuner-plus-monitor combo today, the CTS3 is on the short list. Pick based on your platform, your other gear, and whether you want the integrated Edge experience or a more custom-tune-friendly route.

What it costs (and what you're getting)

Rough numbers on the CTS3 lineup:

For the Evolution CTS3 specifically, you're getting both halves of the upgrade — monitoring and tuning — for less than the price of two separate devices. That's a big part of why it's so popular.

Install: plug it in, mount it, go

The CTS3 is one of the friendlier installs in the diesel aftermarket. The high-level steps:

• Plug the harness into the OBD-II port. The CTS3 reads from there.
• Run the harness up to your mounting location — A-pillar, dash, or vent mount. Hide the wiring cleanly.
• Mount the display. Edge offers several mount options; aftermarket mounts also exist for cleaner integration.
• Power on, configure your gauges. Set the PIDs that matter to you, configure your alerts, save your layouts.
• If Evolution: flash your tune. Pick your level, hit flash, wait a couple of minutes, and the truck is making more power.

The whole install — including time spent customizing gauges — is a Saturday morning. No special tools, no tuning expertise required beyond following on-screen prompts.

What to pair with a CTS3

A CTS3 is at its best when the rest of the truck supports what you can now see and control. The pairings that matter:

• A FASS lift pump — so the supply side keeps up with whatever tune you're flashing. See our FASS guide.
• CP4 protection on any 2011+ CP4 truck — see the CP4 disaster prevention guide.
• A quality cold air intake — see our S&B intake guide.
• An upgraded turbo for Cummins owners chasing real power — the Fleece Cheetah guide lays it out.
• Built transmission if you're flashing serious power into a stock auto trans — see our upcoming BD Diesel and 68RFE guides.

The CTS3 is the cockpit; the rest of the build is the chassis. Both have to be in shape.

What the CTS3 doesn't do (so you set the right expectations)

Honest expectations matter. The CTS3 is excellent at the things it does, but it's not magic. Things owners sometimes expect that it doesn't deliver:

• It's not a custom-tune platform. The Evolution CTS3 flashes Edge's pre-engineered tunes. If you want to run a specific custom tuner's calibration, you'll want an EZ Lynk Auto Agent or similar — not the CTS3.
• It can't fix broken supporting hardware. A great monitor pointed at a sick truck still shows a sick truck. Address the lift pump, the air side, and the reliability mods first.
• It's not a replacement for proper diagnostics. The monitor side is great for trend-tracking and live data, but a real scan tool with bidirectional control is still the right diagnostic instrument.
• It doesn't auto-tune to your hardware. The pre-engineered tunes are designed for stock or lightly-modded trucks. If you've built the truck, you need a tune that matches the build — that may or may not come from the CTS3.

Knowing the limits keeps your expectations aligned with what's actually going to happen when you bolt it on.

Edge's tuning history: from Juice With Attitude to today

Edge has been at this longer than most. Their classic Juice With Attitude in-line modules are still in service on countless older trucks — they delivered tuning via an in-line module rather than ECU reflashing, which mattered for emissions and warranty reasons at the time. As ECU flashing became standard, Edge evolved to Evolution programmers, then to the Evolution CTS series, and now to the CTS3. Every generation has refined the calibration depth, the screen experience, and the platform coverage.

That history matters because Edge isn't a startup with a shiny first product. Their tuning calibrations have been refined across hundreds of thousands of customer trucks over decades. When the CTS3 flashes a tune, it's drawing on that engineering depth — not on a calibration somebody wrote last week.

That's part of why we keep recommending Edge alongside the other major names. Their stuff is dialed because they've had time to dial it.

Common questions before you buy

Is the Edge CTS3 worth the money?

For most owners, yes. You get serious monitoring capability and (on the Evolution) integrated tuning in one device that lives on your dash for the life of the truck. The dollars-per-utility ratio is excellent.

What's the difference between CTS3 and CTS2?

The CTS3 has a faster processor, sharper screen, refreshed UI, better connectivity, and a longer-supported software roadmap. The CTS2 is still a capable device; the CTS3 is the current generation and what we'd buy today.

Evolution vs Insight: which CTS3 do I need?

Evolution if you want tuning AND monitoring. Insight if you only want monitoring (or you're using another tuner). For most first-time buyers, Evolution is the natural choice.

Will the CTS3 void my warranty?

Federal Magnuson-Moss prevents a manufacturer from voiding your warranty just because you installed an aftermarket part. A specific claim can be denied only if they can prove the modification caused that specific failure. The monitor side of the CTS3 is purely a reader and is not modifying anything. The tuning side does modify the ECU; consult your local warranty situation.

Can I uninstall the tune to take to the dealer?

Yes — the Evolution CTS3 lets you flash your truck back to stock when needed, then re-flash your tune after the dealer visit.

Does the CTS3 work on my 2024 model?

Edge's CTS3 compatibility expands over time as platforms get supported. Check the current product page for your specific year, make, model, and engine. Latest-model-year tuner support is a moving target across the whole diesel aftermarket.

Can the CTS3 read my transmission temperature?

Yes — trans temp is one of the most-watched PIDs and it's well-supported across platforms. If you tow, you should have a trans temp gauge on your dash; the CTS3 puts one there with a couple of taps.

Does the CTS3 do safety shut-downs?

You can configure custom alerts at user-defined thresholds (EGT, trans temp, coolant temp, etc.) — visual, audible, or both. Some platforms also support engine shutdowns based on critical PIDs. Configure the alerts you actually want.

How long do Edge keep updating CTS3 software?

Edge has a strong track record of long-term software support across their flagship product lines — the CTS3 is the current platform and is actively maintained. Plan on years of ongoing software updates, platform additions, and feature refinement.

Can I move my CTS3 to another truck?

The Evolution side is typically VIN-locked to a single truck for the tune. The Insight (monitor) side is more portable. If you change trucks, the licensing situation depends on the specific device and the change — Edge support can usually help.

Is the CTS3 worth it on a stock truck?

Even on a bone-stock daily, the monitor side alone justifies the spend for any owner who tows or wants real visibility into what the engine is doing. The gauges that save expensive repairs are exactly the gauges the factory cluster doesn't give you.

Why the CTS3 stays on the short list

Most diesel monitor/tuner devices have a half-life. They get superseded, the software stops getting updated, and they end up as paperweights. The CTS3 is one of the few that has staying power — Edge keeps the software current, the platform coverage growing, and the user experience refined. Bolt one to your dash today and it'll still be there doing its job a decade from now.

Shop the full Edge Products collection at DNR Customs, browse the broader programmers & modules selection, and when you're ready to spec the right CTS3 for your year and platform — and bundle the install with whatever else the truck needs — request a quote. We'll get you set up right the first time, every time.