Originally Posted by blownaltered
That's what I've heard, that they read anywhere from 500 to 1000 rpms higher than your actually running. Might want to look into that before the car gets out of the shop
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They are USUALLY 500 off reading higher than what's actually happening... I have my MSD provide the tach signal instead of the stock ignition, and its wired back to the stock tach. Its within 100 rpm now on the low side... 7200 limiter hit right about 7100-7150 on the tach. The vert is setup the same way. Much better looking than a huge 5 inch tach that doesnt fit on the tiny dash setup, and you get a better ignition to prevent misfires and increase mpg at the same time.