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The tachometer is an electrical device that senses the ignition system. It indicates engine RPM (revolutions per minute). Engine rpm and crankshaft rpm are two ways of expressing the same thing. True, the crankshaft does rotate twice for each complete set of cylinder firings but the tachometer counts each rotation.

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βˆ™ 2007-07-07 19:47:12
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Q: Does the tachometer on a car measure crankshaft rpm or engine rpm considering that the crankshaft rotates twice for each full cycle of the engine in a four stroke engine?
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