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RPM is the abbreviation for revolutions per minute and is a measurement of the revolutions of the engine crankshaft. Literally, if your "RPMs stop working" your motor isn't running. However, you are probably referring to the tachometer, the meter that displays the number of rpm's your engine turns, that has stopped working. There are two basic types of tachometers: electrical and mechanical. Electrical tachometers calculate the engine speed by counting electrical pulses while the mechanical tachometers have a mechanical cable attaching to the engine, generally the ignition distributor or camshaft.

So, if your tachometer is not working you have either have an electrical problem, a broken cable or the meter itself has become defective.

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Q: How do your RPMs stop working?
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