The speed of every automobile is determined with the help of a speedometer. This device monitors the speed of the vehicle, which is indicated by a needle and is operated by the speed sensor. This magnetic coil, which is also referred to as a vehicle speed sensor, is located at the bottom of the transmission system in every vehicle. The model however, may differ according to the vehicle in which it is fixed. The main function of this device is to measure the rotations of the gears and transmit information to the speedometer which is fixed in the dashboard.