help please
 

I have a late 04 my oil cooler went out and sucked all the oil into my coolant and went into limp mode on my wife and she drove it home anyways :argh: so when I got home I put a new oil cooler egr cooler stand pipes dummy plugs hpop ipr lpop and front cover because something went through it so now at idle my oil pressure drops to nothing I put a new switch in it and no luck so I put a manual gauge on it and it shows 5 pounds. after hours of searching the only thing I can come up with is bearing clearance I did put new oil and motorcraft filter does anyone have any other thoughts thanks in advance