Edge CTS4 vs CTS3: Which Digital Gauge Monitor Fits Your Truck?
The Edge Insight CTS4 is now available for pre-order. In the Edge CTS4 vs CTS3 comparison, both are in-cab digital gauge monitors, but the CTS4 brings a bigger screen, much faster hardware, and an upgrade path to tuning that the CTS3 Insight doesn't have. Here's what changed and whether it's worth the move for your truck.
Key Takeaways
| Question | Quick answer |
|---|---|
| What's new on the CTS4? | A 5.5 in. touchscreen with 21% more viewing area, a 1.7GHz dual-core processor with 3.4x the processing power, 2GB of RAM and 70% faster cold boot. |
| Is either one a tuner? | No. Both Insight models are monitors. The CTS4 can be upgraded to an Evolution tuner or Insight+ custom tuner through an internet update. The CTS3 Insight can't. |
| Do they show the same data? | Both read supported OBD-II data. What appears depends on your truck's year, engine and control module. |
| Will my CTS3 mounts and accessories carry over? | Check each part number. Edge's cast pillar mounts are listed for CTS3, not CTS4. |
| Where can I compare other monitors? | Our electronic multi-purpose gauge collection has the CTS4, CTS3 and other digital monitors. |
Screen size, gauge layouts, and everyday responsiveness
The Edge Insight CTS4 uses a 5.5 in. high-resolution touchscreen with a 60 FPS refresh rate. Edge rates it at 21% more viewing area than the CTS3's 5 in. screen, with 3.4x the processing power, 50% faster PID changes and 70% faster cold boot.
The Edge Insight CTS3 has a 5 in. full-color capacitive touchscreen in a slim case, with swipe navigation, customizable gauge layouts and a color mixer for gauge arcs and backgrounds. It's still a capable monitor.
In day-to-day driving, a bigger screen is easier to read at a glance, but mounting position matters just as much. Pick a spot with a clear view and little glare, and set up your gauges before you drive rather than on the road.
For a CTS3 owner, the faster hardware and bigger screen are the clearest reasons to switch. If your current layouts are easy to read and the unit responds well, those changes alone may not justify replacing it.
Monitoring, diagnostics, and data logging
Both Insight models show real-time vehicle data, log it, and read diagnostic trouble codes. The CTS4 adds custom alerts and warnings on the parameters you choose, backup camera support, and room to add compatible Edge sensors for readings your truck doesn't report on its own.
A screen can only show what the truck reports or what an added sensor supplies. A PID, or parameter ID, is one data point the vehicle's control module makes available, like coolant temperature or boost.
For diesel monitoring, the right model is the one that supports the readings you need on your exact truck. If you're watching temperatures and pressures while towing, compare the supported PIDs and sensor options for your year, engine and configuration rather than choosing on screen size alone.
Monitor-only models versus tuning
Neither Insight model tunes your truck out of the box. This is where the two generations split:
- CTS4: starts as a monitor and can be upgraded to an Evolution tuner, or to Insight+ for vehicle-specific custom tuning support, through an internet update. Same device, no new hardware.
- CTS3: the Insight CTS3 stays a monitor. For tuning on that generation you need a tuning model such as the Evolution CTS3, which is a separate unit.
For example, the Edge 85400-200 Evolution CTS3 is a tuner built for the 2001 to 2016 6.6L Duramax, with a 5 in. touchscreen and MyStyle software. Browse all Edge Products for other applications.
If you think you'll want tuning later, the CTS4's upgrade path is the biggest difference between the two. You buy the monitor now and unlock tuning on the same unit when you're ready, where it's supported for your truck.
Vehicle compatibility and the parameters each monitor can show
Neither monitor shows every parameter on every truck. Year, engine, control module and available PIDs all change what appears, so check compatibility for your exact vehicle.
| Vehicle setup | What to consider |
|---|---|
| Gas truck with OBD-II | Check which engine and drivetrain readings are supported for your application. |
| Diesel pickup | Confirm the readings you need for towing are supported, or whether an add-on sensor is needed. |
| Older vehicle with OBD-II | An OBD-II port is the starting point, not a guarantee that every PID will be available. |
| Vehicle without OBD-II | Both monitors connect through the OBD-II port, so a vehicle without one isn't a match. |
OBD-II became standard on North American light vehicles in the mid 1990s. Older vehicles, imports and specialty applications can differ, so the port and its supported data matter more than the model year alone.
Installation, updates, mounts, and accessories
Both monitors plug into the OBD-II port with minimal wiring and update over Wi-Fi.
Accessory fit is part specific. The Edge 28600 cast aluminum pillar mount bolts to the factory A-pillar grab handle location with no drilling, and is listed for CTS3 and CS2/CTS2 devices, not CTS4. See our gauge pods and pillar mounts for other options.
Use the same part-number check for sensors, cables and cameras. Only reuse a component when its listed compatibility includes the monitor you plan to run.
Is the CTS4 a worthwhile upgrade for a CTS3 owner?
Go with the CTS4 if you want the bigger screen, the faster hardware, custom alerts, or the option to add tuning later on the same device. It's also the obvious pick if you're buying your first monitor.
Keep your CTS3 if the display is easy to read, your layouts show what you need, and you have no plans to tune. A working monitor that supports your truck doesn't need replacing just because a newer model exists.
- Before switching: write down your truck's year, engine and configuration, then compare the supported parameters you rely on.
- For accessories: check each mount, sensor, cable and camera by its exact part compatibility.
- For your setup: export any CTS3 logs you want to keep and note your gauge layouts so you can rebuild them.
Frequently Asked Questions
What does PID mean on an Edge CTS4 or CTS3?
A PID is one data reading from the vehicle's control module, like coolant temperature or transmission temperature.
Can I set an alert instead of watching a gauge constantly?
On the CTS4, yes. It supports custom alerts and warnings on the parameters you choose, so you get flagged when a reading changes.
Should I log data before and after changing a tune?
Yes. Keep the route, load and conditions as similar as possible so the two logs are easy to compare.
Can I mount an Edge monitor over an airbag or in my line of sight?
No. Keep it clear of airbag deployment areas and out of your forward view, in a spot you can glance at without reaching across the cab.
What should I have ready when asking about compatibility?
Your truck's year, make, engine and any modifications, plus the monitor model and any accessory part numbers.
Can one layout work for both commuting and towing?
It can, but separate layouts keep each one useful. Set up a simple daily view and a towing view with the temperatures, pressures and drivetrain readings you check most.
Conclusion
The Edge CTS4 vs CTS3 choice comes down to the CTS4's bigger screen, faster hardware and tuning upgrade path against a CTS3 that already does the monitoring job well. Both depend on the parameters and accessories your truck supports.
If you're happy with your CTS3 and don't plan to tune, there's no need to switch for the model number. If you want the bigger display, faster response or tuning down the road, the CTS4 is the one to get. Questions about your truck? Send us your year, make and engine through our contact page.