this is all just a guess as i don't know much about the particular vehicle...
but if it came factory with a gauge you could hook it up electrically. since it just had a light the sending unit (oil pressure switch) probably won't be compatible with your gauge and will give you a false reading/no reading at all.
i've put tons of them in the small block chevy's, i know they are a piece of cake, and quite accurate when you use the tube.
good luck though :O)