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I have a 90 gmc 350/tbi all the sudden the oil pressure guage went to zero last night I started it this morning it went to 35 for about 5 minutes then went to zero. They is ZERO motor noise like knocking or anything. I have been told there is a pressue switch and the fuel pump wont come on is there is under 7psi of oil pressure does anybody know for sure?
 

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Going Postal
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Is it still running after the guag has dropped?

Sounds like a loose connection somewhere and most likely on the sending unit itself.

I think they are located behind the distributer on the top. Should be little round can looking thing that is a real pain to get to. There is one plug on the top. Sometimes it can get oily and stuff.



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