I just bought a 1989 Ford Club Wagon XL (4.9L six) with only 130,000ish km on it, for $700.00. It seems to run well, with decent power and no smoking, but according to the factory gauge, it has low oil pressure. I don't know what the actual pressure numbers are, but the needle sits on the front of the letter N in the word Normal. When trouble shooting low oil pressure, what things should I be looking for and what order should I check them? I don't want to go yanking the oil pan off to check the oil pump if there are a bunch of other things I should be checking first.