Tachometers , a sensor and a measuring device that is used for calculating the revolution speed of the rotating objects. It is used for objects like shafts or disk in the motor of the motor vehicles or other machines where rotation speed is the driving force and is measured in “revolutions per minute” of the rotating object. Talking about its construction, the device comprises a dial, needle, and markings, where needle indicates the result received and markings point at the safe and dangerous levels of the rotating speed that is being measured. Its usage is of extreme importance in many vehicles, which enables the driver to efficiently track the rotating speed along with adjusting the throttle and the gear to the driving conditions. This is done to protect the vehicles from insufficient lubrication, which can cause a breakdown. That is why tachometers form an indispensable part of any vehicle gear. They are an integral part of all those operations where timing and