No on OEM tach. I've never seen the gauges behave erratically before, so I don't appear to have experienced the dash issues you have described. Sounds like connector continuity in that case, maybe where the wiring comes onto the PC board in the traces.
Ya, gotta love it. I remember when ECMs were first coming into vehicle management and I thought darn, when I thought I knew enough of this car stuff to just get by. Of course, if I were 20 all over now, I'd probably have a project car 25 years newer than my Olds and I'd be stuffing an LT1 into it. Instead, my car I garage and prefer to drive even to church is my `68 Olds Cutlass 350 small block, full roller cam with carb/HEI and TH400 with Vacuum Modulator for signal. I just put 800 miles an the engine/trans. It took me over 10 years to put together (10 yrs due to lack of $) And I'd never think of putting anything but 100% Olds under that hood.
Be good and Thanx
Patrick
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