For a carbureted engine, that's borderline. For an injected engine, it's really low. Most likely it's the fuel pump.
Many parts stores like Pep Boys and Autozone have loaner tools. Some of them have oil pressure gauges you can borrow or rent for dirt cheap. If you suspect low oil pressure, you need to see what the pump is producing. You're looking for a minimum of 30 PSI at idle, going to about 40-50 for regular pumps and as much as 65 for high pressure pumps.
You might try checking self-serve junkyards to find the vacuum lines you need if you want to keep it all original looking. Otherwise, Pep Boys or Autozone like stores again.
Sunday, October 2nd, 2011 AT 11:03 PM