I just picked up an Auto Meter oil pressure guage from O'Rielly's website under clearance section $60 value for $14.97. It is mechanical so you have to run a oil line from guage to engine. I started a new thread http://www.thedieselstop.com/forums/f30/oil-pressure-guage-288120/ on the 7.3 IDI (non powerstroke) side asking about this.