Oil Pressure Sender

[WVZR-1]

Originally Posted by csavaglio

Better yet, can someone ohm their sender out while the car is idling and warm, i.e. when their gauge shows about 20psi, or 1/4 of the way from 0 on the gauge.

At this point, I'm not convinced it's the sending unit that's the issue. It seems like there's extra resistance in the circuit somewhere, but I can't find in the FSM anything on the circuit other than a really simple wire diagram with the gauge on one end of the wire and the sender on the other.
Thanks
Chris

It's been a very long time since I've had to do cluster diagnostics on anything but I couldn't remember struggling quite like I had yesterday. Well it seems you've a FSM so if you go to 8A-82-11 Chart #3 you'll see the approximate resistance values that the dash gauge wants to see. Using your DMM you could check the sending unit for it's output similarly. It's very straight forward and I feel a bit foolish not catching it yesterday. I think the last cluster I maybe needed to check OP gauge on was maybe an '85 CK truck that I felt displayed low. That truck was new then. It used the "bell type" sender you stumbled on yesterday at Summit.

The real KM "signal generator" still brings a pretty hefty price on eBay. There was one that looked pretty realistically priced.

Haven't seen "scottfab" for a while maybe he could explain how to use a 100 Ohm potentiometer as a signal generator to check the cluster.