I don't have much exp with AC.. but I do have exp with many other makes. in general.. cam is a big oil pressure loss. Be glad you have replacable parts.. in ford N series engines. the cam runs bare in the block!.. nothing to replace. If you have some oil pumping. the pump is primed. Now.. if your pump is worn, or if there is an oil pressure refief set low or stuck open.. yuo can loose a few pounds there. If it were me.. I'd replace the gauge. Iv seen upwards of 4 psi difference on vintage gauges to new gauges, on an otherwise 'good / functioning' gauge. In some cases.. 4 psi may be the difference of overhauling it now or waiting a few years. Next.. I would perhaps try a 40w oil if i were in a warm environment. if you ar ein a cold area.. that's not a good option. next would be to do the cam and oil pump repair.. if the oil pump is easier to get to.. I'd try that first.. with the knowledge that I may have to go back in later to correct the cam issues. That's general info.. but it has served my well on my small 'fleet' of tractors. Soundguy
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