Ok. So rebuilt my 7.3 idi about 3000 miles on it now. Rod and main bearings obviously new. Crank polished mic’d and double checked all bearing clearance’s with plasti gauge. The truck factory oil pressure gauge stays between r and m. My understanding is that gauge will drop only if pressure drops below 7 psi. And that these motors don’t need a lot of psi. My manual gauge reads about 30-35 at anything over 1200 rpm. Always dropped to about 10 psi at idle from day one. But lately it’s started dropping to about 3-4 psi at idle. My factory dummy gauge still reads around the r. No blow by or white smoke. Runs like a scalded dog. Please help!!! Why no oil pressure at idle?