04/30/2026
I built this custom gauge display for our 2018 4Runner SR5. It plugs into the USB port below the climate control, and automatically connects via Bluetooth to an OBDII plug.
Using gauges and numbers, it displays transmission Torque Converter temp, Engine Temp, Battery Voltage at the ECU, Engine Load, Pitch and Roll (with 4Runner graphics), and Altitude using a built-in GPS receiver.
I custom designed a 3D printed case that fits the curve of the dashboard, and the module mounts on the dash with removable 2-sided tape. The display auto dims for proper night viewing.
We took a drive through Utah and Arizona, and I learned a few things. The torque converter temperature does vary. The highest it got was 190 degrees, while making a slow climb up a mountain pass behind a bunch of truck traffic. It dropped quickly (within a minute) to 140 when we were back to normal driving.
The engine temp is rock solid around 185 degrees - I assume that’s the thermostat setting. The voltage at the ECU was constant around 13.4 volts. But it drops a bit when the AC is on – not sure why that would happen.
The engine load is surprisingly low when traveling at speed on the highway. I guess that makes sense. The pitch and roll are fun to watch when off-roading. A downward pitch of 14 degrees seems a lot steeper than it really is…
Anyway, I thought you would enjoy this. The 4Runner provides several custom Toyota parameters (like torque converter temp) via the OBDII port. I would like to see oil pressure, but the 5th Gen SR5s don’t measure it (or at least don’t provide it via OBDII).
https://etsy.me/49mFfbd
This Car Accessories item by FabForgeFive has 146 favorites from Etsy shoppers. Ships from Salt Lake City, UT. Listed on Mar 30, 2026
