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!
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For all the work the engine is doing, it ends up spinning a shaft that ends up connecting to the tires and moving the car. The RPM meter measures the revolutions of that shaft, not the wheels. You’ll notice that when the car shifts gears (which change the rate at which the shaft spins) that the meter also dips rapidly before going back up. When the RPM meter goes into the red zone (spinning too fast) that’s when the transmission should shift to a new gear.
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