Join Date: Mar 2002
Location: Austin, TX, USA
Re: Anyone know how to calibrate an OER Tic Toc Tac
To my knowlege there is no tweaker to offset the reading. I think they are laser trimmed at the factory to hit a spec. Bench testing is difficult. It requires a signal generator and even then it's difficult to simulate the hostile voltages that a real ignition circuit presents.
Probably the only thing you can do to offset it is to remove the needle and put it back on again. But it'd be fairly certain it's 400 RPMS off at multiple values. It could be non linear in which case a needle R&R won't really fix it.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI