Speedometer vs. Tachometer

Speedometernoun

A device that measures, and indicates the current speed of a vehicle.

Speedometernoun

Such a device incorporating an odometer.

Speedometernoun

a meter fixed to a vehicle that measures and displays its speed

Speedometernoun

an instrument on a vehicle's dashboard indicating its speed.

Speedometer

A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards.

Tachometernoun

A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.

Tachometernoun

A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc.

Tachometernoun

An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance.

Tachometernoun

An instrument for measuring the velocity of running water in a river or canal, consisting of a wheel with inclined vanes, which is turned by the current. The rotations of the wheel are recorded by clockwork.

Tachometernoun

An instrument for showing at any moment the speed of a revolving shaft, consisting of a delicate revolving conical pendulum which is driven by the shaft, and the action of which by change of speed moves a pointer which indicates the speed on a graduated dial.

Tachometernoun

An instrument for measuring the velocity of the blood; a hæmatachometer.

Tachometernoun

measuring instrument for indicating speed of rotation

Tachometernoun

an instrument which measures the working speed of an engine (especially in a road vehicle), typically in revolutions per minute.

Tachometer

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.