Speedometer vs. Tachometer

Speedometernoun

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

Tachometernoun

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

Speedometernoun

Such a device incorporating an odometer.

Tachometernoun

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

Speedometernoun

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

Tachometernoun

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

Speedometernoun

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

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.

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

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.