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**Wrenchbender Ret** · 07-25-2017, 10:54 PM

I agree, the first thing to do is check the pressure with a master gauge & see what it really is doing. If OK I would replace the sending unit. 9 times of 10 that is the problem when the gauge acts up. There is a lot of difference in oil pressure when the engine is cold & when it is hot.

07-25-2017, 10:54 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,190	Re: 78 C10 oil pressure readings and grounds I agree, the first thing to do is check the pressure with a master gauge & see what it really is doing. If OK I would replace the sending unit. 9 times of 10 that is the problem when the gauge acts up. There is a lot of difference in oil pressure when the engine is cold & when it is hot.