I get that seeing the tachometer is important for manual cars, but I drive an automatic. It exists, but when I drive I never look at it. So why are they on automatic cars?
In: Engineering
Running an engine near its maximum rotation speed can damage the engine.
While automatic vehicles can shift the gears for you, if you accelerate too quickly or drive at too high of a speed, that can still cause engine problems.
The tachometer is there to warn you in case you are overworking the engine.
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