i have a .030 over 454 and have a wierd problem. i have a 2 1/16 autometer mechanical oil pressure gauge on the front port on the engine. when you first start the engine in the morning, it will read 64 psi at idle. it will go up to 70 when warm and driving. but, if you shut it off, and start it right back up, it will read a diffrent reading. you watch the gauge and it will hard stop anywhere from 24-40 psi. when you rev it, it will not move. i ran another gauge to the other port on the engine, and that reads 60 psi hot at idle. i even tried a diffrent gauge in the same port as the original gauge, and it reads 60 psi. can this be a gauge problem, or would it make more sense to say there is a line problem? i use copper line for the gauge, not the plastic one that comes with the gauge. i checked the line for kinks or bends, and none to be found. i even tried to "bleed" the line at the gauge, but still this problem. the engine only has 75 miles on it, an the gauge has the same.any advice???