Ok here's the deal:
Just got my 402 back from the speed shop after rebuilding. First time I fired the engine only showed 20 psig on the electric oil pressure gauge. Shut it off and hooked up a 80 psi mechanical gauge. Fired it back up and the mechanical gauge was buried at 80 psi. Went and got a new 100 psi sending unit for the electric gauge, installed it and fired the engine again. Now the 100 psi gauge is buried at 100 psi. I realize everything is new and tight, but I think this is way too much oil pressure! 7 qt. Milodon oil pan, Melling high volume oil pump (the speed shop checked the valve in the pump before installing and it opened at 70 psi), gauge is plumbed in right above the oil filter, Castrol Syntec 10W 30 oil. Fram PH30 oil filter. Can't think of anything else that might help diagnose this problem. Any help or advice would be appreciated since I'm about to pull out what little hair I have left.