1984 Ford Bronco low oil oressure and idling problem

Engine Performance problem
1984 Ford Bronco 6 cyl Manual 140000 miles

I have a 1989 ford bronco 4.9, 6cyl that has been giving me problems!My oil pressure will go from normal to low and as of today it stays low!I also was having idling problems as well!I notice that when my truck would almost die out or die out the oil pressure would drop!I just replaced the ignation coil, new battery, new throttle body gasket, new upper intake manifold gasket(not the lower one yet)A new oil pressure/sending unit!I need a new gasket for the egr but made a makeshift one because I couldn't get one it seems to work untill I get the new one!I got it to idle better actually it is to high so I need to turn it down!But I still have low oil pressure!I need to get some new vaccum line because I broke the plastic ones that were on there but patch it up with rubber ones!I plan on getting new ones!My main concern is the oil pressure because I don't want to blow the engine!Or damage it!Any ideas!