SOLVED SOLVED SOLVED
For ***** and giggles my friend rummaged through a scrap metal bin and found a 20+ year old used original one, installed it....truck instantly makes oil pressure and the chatter is gone.
TWO BRAND NEW PUMPS IN A ROW, DIFFERENT BRAND, DIFFERENT PRICE TIER WERE GARBAGE NEW IN BOX ON ARRIVAL.
200+$ worth of lost fluids and gaskets later.... I don't want to live on this planet anymore.