The reset feature didn't work when my tach was reading about 3,000 rpm too high. I had to disconnect a battery cable and leave it disconnected for about 30min before reattaching it which cured the problem.My rpm needle off by 1k when the engine is off. I just tried the reset procedure in the manual and it fixed it.
My question is would it last? Would it keep coming back? Anyone have the same problem and the reset procedure actually fixed it?