does anybody know where the lubrication oil pump is on the motor???, the hpop is in the engine valley, and wheres the oil pressure sender??

 

It's on the front end of the crankshaft.

 

i was afraid you were going to say that.......im trying to figure out where to put an accurate gauge in, thinking im gonna pull the pan to see if the pick up came loose, oil was slightly foamy when stick was pulled. going to put a extra quart in it to see if it picks up before i yank the pan. do you need a puller on that crank pully???

 

Most likely you'll need a puller. Honestly I have never had to do it on a PSD, but just looking at it tells me that I will need one when the time comes. You do realize the engine has to come out to remove the pan?
And just to reinforce your diagnosis, I agree look at the pickup tube.
I have seen this behavior countless times in the past on the old Audi 5 cylinder engines. It was a very easy fix - remove the oil pan and replace the pickup tube. The screen was too fine on the factory pickup and it would clog with the finest of particulates. Then the oil would begin to airate and foam badly. Noisey lifters, engine starting to sieze due to only 5psi or so of oil pressure on the freeway. Replace the pickup tube and instantly they would easily maintain 40 psi at idle hot.
Unfortunatly your oil pan is much more difficult to remove, engine coming out and all that rot.
I have heard on this forum or maybe the "other site" that one way to get at the pickup is to cut the bottom of the oil pan off, repair the pickup and then weld up the pan again. It would be a fairly easy job if you have the facilities for that sort of thing. Be carefull when welding a closed container like that, it can explode. You would need to connect a vacuum cleaner to the oil filler and remove the drain plug and run the vacuum cleaner while welding to remove the combustibles that would be produced while welding. Or compressed air introduced through the drain hole with the filler cap removed. Just some way to keep air flowing through the crankcase while you are welding the pan back up.