Where are you not seeing oil pressure Jake? If big ends and mains were that bad,you'd be having a bit of a death rattle and that would happen over a long period. If the head gasket's already suspect, you're probably pumping oil into a cylinder or waterway. If in doubt, or if you reckon the sensors might be faulty, run the engine on idle and slowly slacken off one of the oil pressure sensors to see what's getting to the top.