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Just lately my oil pressure gauge it fluctuating. It will read a steady pressure when I'm driving but once the engine is warm at idle the pressure drops of course but it jumps from 20 psi to about 30. I'm thinking its the oil sending unit but where in the world is that located at. Because I can only imagine the Haynes manual will be helpful in all its infinite wisdom. I have a 90 GTZ quad 4.

See the engine lift bracket on the exhaust cam tower?  See the broken sensor under it (just above the thermostat) ?  That's it.

Thanx for the help now I just need to locate one at a parts store.

Yea without having to order it. I can get one at Advanced for cheaper. I would rather see the part before purchasing it.

I dont know why it says online store only, I was just up there for oil and inquired about that sensor.  They had some in stock.  

Its hard to say with Autozone. I have to stop and get oil so I'll see if they do have any. Of course the website has said before they had something in stock and when I got their it wasn't.