hi again, the symtoms were exactly the same as yours with the oil pressure dropping like a stone at low revs. keep a close eye on your coolant level, to be sure.
the issue with the gaskets was not head but lower intake and timeing case gaskets.
do a search on the v6 4,2 forum "hydro locking" and hopefully it may save you the cost of a new oil pump. hope all is well bokker.