I think that you will find that if you install a good quality Auto-Meter tach and leave the stock tach hooked up and watch both function as you drive you will see just how inconsistant and unreliable the stock tachs are, ESPECIALLY above 4,500 rpm's. The stock tach does not even come close to representing what the real rpm's are at the hiogher rev's. I have found this to be true on every 5.0 that I have ever seen, literally hundreds of them.
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No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!
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