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It is possible that your sending unit is a 60 PSI unit, multifuel trucks had both 60 and 120 PSI sending unit available and someone might have installed the wrong one, I have seen it more than a few times in 20 years of this fun. JT

Go buy a mechanical gauge at auto zone or parts America or anywhere and put it where the sending unit goes, than you will know if you have low oil pressure. Then, get a manual on the repair/adjustment of the external oil pressure regulator over on the alternator side of the engine, behind the...