Oil Pressure Sender - 89 YJ
I'm sure this has been covered somewhere, but I couldn't dig it up with searches...
My oil pressure guage does the familiar full scale deflection or no movement at all when starting up. Randomly, although lately its been just no movement. A while back it would randomly shift from full scale pegged to the actual oil pressure, but not often.
The sender is on a small manifold block with a single sender pointed straight up that matches pictures of guage senders with a single wire. Also sprouting from that small manifold/adapter thingy is another sender angled upward and forward with a two-wire connecter attached.
My dash does not have an oil pressure light, just the guage. The Jeep is a hodge podge of parts thrown together, so I don't know if the engine came from a Jeep with both guage and light, or what.
Any one have the real scoop? I don't want to plunk down $33 for a sender if the guage is bad, or screw around with another circuit that may or may not do something else related to oil pressure.
I tried grounding out the single wire from what looks to be the guage sender and got no response from the guage. Also checked for voltage at the green wire that hooks to that sender - nothing.