Well, yesterday i installed a shift light i had out of my peripheral car. It was just laying around, so i figured i might as well throw it in.

seems at thought my stock tach, is off about 300rpms at 8k rpms.

How far is all of your guys tachs off? CJ

 

Mine is off about 250 rpm at redline. When I was on the dyno, I let off at 8500, but I went back and calculated the rpm, and it was ~8250. The graph was in mph, not rpm along the bottom.