spent about $90 for isspro gauge, have 9psi at idle and 5psi at WOT in 5th gear. Now have just 11k miles on this truck since new. Bought banjo fittings from genos and added aeroquipt 3/8" ID hose with pushlocks and #6 AN fittings, with a vavle in the middle. I can remove the sending unit after closing the valve, then attach a short length of hose with a needle valve to fill up a clean container with filtered diesel for when I change the fuel filter. Already tried it out, works great!