When you’re running different sized tires on your Jeep, a speedometer calibrator is the perfect accessory to correct your speedometer readings. It can also compensate for gear ratio changes that would normally throw your stock calibrator out of whack. As an alternative to a performance controller, the calibrator is easy to switch for correct readjustment. Choose from popular brands like Jet Performance and Pro Comp and be sure to select a calibrator capable of interfacing with your Jeep system. Calibrators may require updates that have to be downloaded from the computer and are easy to install.