Dodge Speedometer Calibrators

Basic set up with a nice case. The plug and play adjustments are easy to cycle through. I have a 2012 Jeep JK also and was going to adjust for tires on it also, but due to the interface on this device, it will only function on one vehicle. The VIN is stored in the first vehicle installed on. I did have to lower my tire size 1in smaller to get the actual true speed. Rough Country said this is the proper way of getting the actual speed.