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. Somedays everything is fine ,other days its good and then drops to close to 0 after reving for a while, when I go back to idle the pressure will slowly climb back up and then go back down when the engine revs again.

(1) As said confirm true psi with a mech gauge (my guess bad elec gauge/sender) (2) toss in an extra 2 qts of oil on the chance the pickup is too far from the pan (not real likely but an easy check) & the extra slosh wont kill ya for a 1 day check. (3) if all good so far then the pan has to come off as zero psi (even briefly) ain't gonna cut it so you can dig in further but the ok/not ok makes me think elec gauge problem

live every 24 hour block of time like it's your last day on earth