When you change the gear ratio or tire size on your computer-controlled car or truck, you throw off your automatic transmission and speedometer. That's no problem as long as you have the JET Accu-Speed Speedometer Calibrator.

The Accu-Speed connects to the transmission output speed sensor and adjusts the speedometer to compensate for your new setup. The Accu-Speed corrects your speedometer to within 1% accuracy, so you no longer have to worry about not knowing your true speed. The Accu-Speed also corrects shift points in your automatic transmission, ensuring the smoothest, most efficient ride. The Accu-Speed is calibrated by simply turning a switch and can be used over and over again any number of times, great news for those who are frequently changing their mods or who want to return the vehicle to stock.