Speedometer
The speedometer shows the vehicle's speed in either kilometers per hour (km/h) or miles per hour (mph).
See also:
Speedometer and Odometer
The speedometer shows the vehicle speed in both miles
per hour (mph) and kilometers per hour (km/h). The
odometer shows how far the vehicle has been driven, in
either miles or kilometers.
This ...
Tachometer
The tachometer displays the engine speed in revolutions
per minute (rpm). ...