chevy 5.7 L low oil pressure need help!
 

Hey everyone I gotta a problem I have a 93 z71 ext cab with the 5.7 and the other day I put a new intake manifold gasket on because it had a small leak. Well after getting this done it runs fine but when I first start it up cold it will run just barely above 30 on the oil pressure guage and after the engine gets hot it drops to around 16-18 lbs pressure while driving down the hwy at 55 or so it dont increase when you increase the rpm's. I dont recall it doing this before. I put a new sending unit on it but same old thing any ideas? Thanks.

How many miles on the engine?