Bringing this up in case it's relevant...
I thought I had read here in the forums (sometime over the last 15 years!) that if a gauge pod was added to a Fiero that didn't originally have it that one of the gauges that was now redundant
in the original instrument cluster needed to be disconnected/eliminated (otherwise the readings were incorrect). I believe it was the oil pressure gauge. Anyone know what I'm talking about?
I don't remember every year and model variation, but this is the tach that a V6 Fiero which comes with the center gauge pod uses.
And this is the tach that a V6 Fiero uses which doesn't
have the center gauge pod. Notice the oil pressure gauge. If I remember correctly, you don't
want that one still connected if you add a center gauge pod (which has it's own oil pressure gauge). You can either swap out the tach to the other style, or simply disconnect the oil pressure gauge on this tach.
[This message has been edited by Patrick (edited 01-31-2015).]