One other thing to keep in mind when running an electrical oil pressure guage. If you do not run a SS braided line off of the oil filter housing and mount the pressure sending unit on the firewall or away from the engine, you're going to end up replacing them often. The engine vibration (almost always in a built motor/cams) will knock the sending unit out.
My suggestion is to spend the 30 bucks or so on a line and don't every worry about losing a reading again.
