Tachometer is an instrument that tells the driver how fast the engine is rotating, commonly including a redline to indicate the maximum engine speed.

Webster Dictionary Meaning

1. Tachometer
- An instrument for measuring the velocity, or indicating changes in the velocity, of a moving body or substance.
- 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.
- 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.
- An instrument for measuring the velocity of the blood; a haematachometer.
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