752iha; Could you post a picture of your oil cooler set-up........might be where your lack of oil pressure is happening? That would be the first place I would look, especially if the cooler was something you just installed......Was it?, or has the cooler been there before and working fine? For sure don't run the engine until the oil pressure is fixed. Even a worn pump or stuck relieve valve should give you some pressure? Be interesting to find the problem...........

Good luck : Clifford