mr_vaughn

iTrader: (1)

i was checking my RPMS from my Apexi AVC-R boost controller and found that my stock tach is about 50 rpm off @ idle
100 off @ 2000rpm

300 off # 3500-4000 rpm.
and so it goes as it gets higher...

i know that the rpm is not used to any boost control.

Just checking if anybody noticed it with any other tachs???

RotaryResurrection

iTrader: (8)

Stock tachs are always off versus aftermarket units of any sort. They are not that accurate after x number of years. This is true with most any car. IT is usually the stock tach that is off, not the aftermarket.

Scott 89t2

digital > analog