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
Because it is measuring the revolutions the engine is making, not the tires. Even at a complete stop, if the engine is on it is turning.
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