okay i have a 89 CRX Si, and well my taqch seems to be off at the most of 800 RPMS depending on where i am at, i hav e p28 ECU and a d15B, and the redline only goes to about 6400, and i know it should go to 7200, but also the **** is off by about 5-800 RPMs during the rest of the RPM range, now my question is can i calibrate it myself easil? and if yes how? but if not do i have to take it to a honda dealer or can i take it anywhere? and how much should it cost.

 

most sock tach are off alittlebit

 

get an aftermarkeet tachometer..like the previous poster said they're off a bit..With my b16 it showed 7500 revs, the vafc showed 8190 revs,the autometer showed 8200 revs.