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I have a shift light with no tack. Does this read off the stock tach (which is super inconsistent) or does it read light up off of actual engine RPM.
 

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When I had a stock tack and an Autometer tach I could not believe how far off it was. The stock rev. limiter is 6250 right? I was shifting at 7000 and still no rev. limiters kicking in. On average I was seeing a 1,000 rpm difference.
 
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