WATCH YOUR SPEED! Finally you can get instant and accurate GPS speedometer recalibration without the guesswork! Available for Jeep JK, 15-17 F-150, 07-16 GM 1500. | Rough Country

Put the finishing touch on your lifted vehicle with Rough Country’s Speedometer Calibration Device! This easy-to-use Speedometer Calibrator helps you quickly and easily reprogram your vehicle’s speedometer to match the output of your larger tires. Your vehicle's computer is designed to track the speed based on your stock tire height. When upgrading to larger tires, there will be a discrepancy between your actual speed and the readout on your speedometer. This plug and play device connects direct