Crawler
Full Access Member
The LPO gauge in the dash is the last item in a long chain to get a signal. Some trucks will never show oil pressure on the LPO gauge while cranking. If you pull the oil filter and crank the truck and the oil filtered housing fills, then you should have LPO. May have to throw a mechanical gauge on it to see it while cranking.
But it’s about impossible to have any HPO without LPO.
But it’s about impossible to have any HPO without LPO.