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How accurate is the c5 tachometer? Reason I ask is I picked about a second in the quarter on my highly modified 5.0 fox mustang by putting a shiftlight in it as I was short shifting and didn't even know it. I am thinking about adding one to my 03 z06.
For all intents and purposes the Tach is pretty accurate on the C5's
C4's had quite a bit of issues with the electronics but the C5's accuracy is real close - I know mine is especially when it is hooked up to HP Tuners or the Dyno -
If you get it tuned have them check your Tach against the Dyno!