Rebuilt Engine, Super Low Oil Pressure :(

GPM normally, and a good solid stream.
As in if you started it and walked around to see it should have made a huge multi quart puddle.
Do you remember tightening the oil pump down?
Or happen to leave a rag in it?

It happens.

Damn...

I torqued it to spec. The pump is brand new. Pretty sure I didn't leave a rag in it. Unless there are other suggestions, looks like I need to pull the engine and check the pickup tube and oil pump...