AutoMeters Electronic Programmable Speedometer provides an easy-to-install and easy-to-calibrate solution that will help keep your speed exactly where it needs to be. These accurate and responsive speedometers are compatible with most factory and aftermarket speed senders, and youll wonder why you ever struggled with a speedometer before. Calibration is as simple as a two mile drive, or for even easier operation, AutoMeters GPS Speedometer Sender is a simple solution for any AutoMeter Programmable Speedometer.