[fallingat120mph]

Chasing a good idle. 1986 3.2l...

Just got in an automotive multi-meter and am reading 790-820rpm at the engine but the tach is showing right/well below the 750 mark. Idle is steady...

I have always felt it read low and now have some verification. Is this a situation to send it off for calibration or is this something I can do/adjust myself?

I have searched and only come up with "bouncing tach" threads...

Car is running/idling great just my tach is reading low.

Thanks for any insight-
Erik