Speedometer Calibrator Color Chrysler (3400)

This worked remarkably well. Recalibrated a 2019 Ram 1500 recently without trouble.Software updates:Installed software updates on a PC without issues immediately after receiving product.Quality:Build quality is sufficient to me. The screen size is awesome and cables are great. Almost went with the Rough Country online unit, but dreaded the thought of having to remove so many panels to install it. Glad I went this route. Much much easier to install. Just remove one panel and connect to two ports.Vehicle install:First hookup was a little tough because of positioning of the green ports under dash. Had to partially remove the panel under steering wheel. Cable length was sufficient to get the job done. Device booted up and recognized my VIN immediately. I did have to tune a few times to get calibration as close as possible (dash & GPS). Recently upgraded to Radar Renegade 295/65R20 (35.1"") tires. Initial variance was 5-6 mph over speedometer reading. After a few tunes, I settled on a tune of 34.75"" with only a sporadic 1 mph under speedometer reading variance while driving 50 mph. Close enough for me. Measuring the actual tire height made dialing in the initial settings to start with very helpful. Really like that the unit checks for DTCs and allow you to save settings with custom labels.Overall:Will report back after testing at higher speeds. Shifting is drastically better now. Will just have to remember to return to stock settings before servicing truck at a dealership.Fuel economy update:Extremely pleased to note that I am back to 16+ mpg since lift and 35s because of this calibration tool. Haven't had any issues described by other reviewers. Will circle back around if anything changes. All good so far.

This little gadget makes resetting your speedometer a breeze! It takes about 10 mins and the truck responds to the new tire size. This best thing is no drop in mileage with the new, larger rubber on the rims!

2020 Ram 2500 with a 6.4 Hemi - Worked just like I hoped. Took about 15 minutes to calibrate my speedometer after installing larger tires. About 5 minutes to find my glasses and read the instructions, 5 minutes to get my old fat gut under the dash and 5 minutes to set the speedometer. FYI - you can set tire size in 1/4"" increments.

Does what it says it does.