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The tachometer DOES NOT have anything to do with charging the battery in a car at any time. The tachometer simply reads, and relays to the driver, how fast the crankshaft in the engine is turning. This is displayed in RPMs, short for "revolutions per minute" representing one complete revolution of the crankshaft. On some newer cars, the tachometer may share a signal from the crankshaft sensor with the ECU(the car's computer) as well.

The charging of the battery is handled by the alternator or generator which is most commonly belt driven and attached to the front of the engine. It may have gauges in the dash such as a Voltage gauge, Ammeter, or just simply a "dummy light" that illuminates and warns the driver of charging problems should they arise.

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Q: Does tachometer has to do anything with the charging of a battery while driving a car?
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