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Originally Posted by stingc
It's also so you can shift it if you want - just like a manual. And you do need a tach to shift any car if you're really beating on it.
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Manually shifting a factory spec automatic is usually a waste in my opinion. It'll make you feel fast but you won't be that much faster. If you need a tach to shift you don't know your car, tach shifting is only useful if you have a dyno sheet to go by otherwise you don't really know the best rpm to shift at. Most drivers shift by feel/sound.