So I was driving along and then all of a sudden the oil pressure gauge went to zero, me panicking pulled over checked the oil... and it was fine. so any idea why the sensor would go out? checked the fuses and they were good. and I'm starting t o hear a slight ringing coming out of the back part of the wagon... almost like a u joint but without the problems that come with that. It's an 88 GL btw.

Might be wireing. The sender's do go out as well. Check the resistance of the sender - if it's infinity then you have a bad sender. If you get a reading while it's not running and a different reading when it is running then you have wireing issues.

 

GD

check the wore to the oil sender, it runs down along the dipstick tube and plugs into the oil pump. its possible the wire came off. check the ground wire on the water pipe by the battery. the big one goes to the fender, and the small one plugs into a clip near the coil

 

there is also a ground wire on one of the intake bolts on the manifold for the engine harness.