Have 2000 dodge ram 1500. Has 5.2 . When drive the truck oil pressure runs about 40 psi. But when tuck goes up a hill and passing kick in and rpm go up over 2500 oil pressure gauge drops down to 0 .
First I would try doing a motor flush may have clogged oil orifices in engine block if that does not help could be a bad oil pump or worn rod,cam or crankshaft bearings.