Aftermarket Metric MPH KMH KPH Speedometer for Car&Truck Digital, Aanlog, GPS, Mechanical, Electronic

Speedometer is a gauge that measures and displays the instantaneous speed of a vehicle. The general speedometer measures the speed by indirect contact with the tire, so errors are prone to occur. GPS speedometer uses pure mathematical techniques to measure the speed of the vehicle, so it is more accurate than ordinary speedometers.