The only time I’ve ever really seen it happen is on cars that have auto stop/start, which essentially turn themselves off anyway.
Edit: Thanks for the answers everyone! I, in fact, did not know to begin with that it is called the tachometer and measured the revolutions of the engine and not the tires!
In: 5
RPM stands for revolutions per minute. The tachometer (or RPM meter) measures the RPM of the motor, and not the speed of the vehicle, so anytime the motor is running the tachometer is measuring revolutions regardless of whether the vehicle is moving out not.
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