A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles,

A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.

speedometer have identical meaning: a device that measures speed. It is by arbitrary convention that in the automotive world one is used for engine and the other for vehicle speed.

1. SPEEDOMETERS
2. TACHOMETERS
3. ELECTRONIC GAUGES
4. OIL PRESSURE GAUGES
5. TEMPERATURE GAUGES
6. AMPERE METERS
7. VOLT METERS
8. OTHER TYPE OF GAUGES