IMHO
IMHO, a mechanical gauge is the best. My favorite is Dipricol. I don't know what kind Rip sells, if your interested in Dipricol, call Ken Jones of Diesel Performance of Utah at (801) 791-2328 . He sells a ton of them, at great prices. He also offers a complete component kit for the fuel pressure gauge, which includes the fuel isolator, lines and schrader valve. . everything you will need for the install. No more looking for fittings, grease hose connections etc. He can be contacted M-F 9:00am -3:00 pm Rocky Mountain Time. Oo.
Steve