You don't need a tach. Red line rpm's are high! Unmistakably high.
You'll hear the car racing at a noticeably high rpm which you would never
drive at. Don't go that high and you'll be fine. There is no fixed shift
point for normal driving. You shift where the car will comfortably handle
the next gear and before it is screaming. It's a common sense thing. You
really don't need a tach and you don't need to be worrying about where to
precisely shift. Just drive the car sensibly. Enjoy it.
The engine computer will cut fuel if you begin to overrev the engine. It's
a failsafe built in to the programming.
I think the only way to actually overrev the engine is to shift into too
low a gear for engine braking.
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