major oil pressure problem.

[boosted92laser]

I have a 4g63t motor that was rebuilt 500 miles ago. It has the balance shafts removed. It has 3rd revision lifters in it. I finally got an aftermarket oil pressure guage and installed it in my car. When started for the first time of the day, the oil pressure is about 20-25 psi. Once it warms up, the oil pressure drops to about 5 psi. When I'm driving it, it goes up to 75 psi.
Just to let you know, the sending unit is in the same location as the original one was.
From everything that I've read, the oil pressure should be about 12-15 psi at idle when warm, and as high as 100 psi at startup. Mine never reaches 100 psi, it tops at about 80.

I'm confused and scared to drive me car until I figure out what is wrong. Luckily I have another car that I can drive till I figure it out. I need all the help I can get on this, please.

Thanks, Bill

 

[oldman]

But hey, there is no better way to learn than hands on.

Except maybe helping others in solving their problems and learn from their mistakes.

 

[boosted92laser]

Except maybe helping others in solving their problems and learn from their mistakes.

True. I hope that somebody will learn something from my mistake.