+A tachometer is an instrument that measures the rotational speed of a shaft or disk, typically displaying revolutions per minute (RPM). It is commonly found in vehicles, indicating the [engine's](/wiki/engine) speed to help drivers optimize performance and prevent damage to the [crankshaft](/wiki/crankshaft).
+## See also
+- [Speedometer](/wiki/speedometer)
+- [Odometer](/wiki/odometer)
+- [RPM](/wiki/rpm)
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