I just drove my 91 Formula from my home near Dayton, OH to Indianapolis and back. I noticed on the way back that my oil pressure gauge was freaking out and jumping all over the place. It will sit at a certain pressure for a few seconds, then it will jump and max out to the right for a second, then it will go back down, then it will jump up a little, then back down... and it just goes all over the place. What the heck....?

 

Max indication = max sender resistance, which also = disconnected wire.

Check the wire; if it's OK, you need a sending unit.

 

Another thing it could be is a lose connection. I know mine will go a little postal now and then and it is just because the connection is getting loose.

 

Thanks for the info...

where do I check? behind the gauge cluster?

 

At the sending unit. Behind the distributor.

 

Alright, thanks, I'll see if I can't find it

(I don't know exactly what I'm looking for, guess I'm 'bout to learn though )

 

it may also be a loose wire behind the gauge.