I have thier boost and pyro guages now. Im going to add a lift pump here soon and was wondering if they make an fuel pressure guage? i couldnt find one, preferable electric since i dont like running mechanical in the truck.

Try Diesel Manor, a vendor on this site. I used a Isspor mechanical fuel pressure gauge on my Dodge. I used a needle valve before I ran the line in the cab so very little fuel goes inside the cab. No leaks in four years. It seems that some electric fuel gauges have a very short life. The sending units fail.

Where you get the needle valve? what did you use to tie in? the braided hose or the 1/8 tubing?

Yes, stay away from electrics. I too had an electric fuel pressure guage on my 2002 Dodge and the sender only lasted about 6 months and it was mounted away from engine vibration. These were Autometer guages and not Isspro, maybe the Isspro sending units are better? I don't know.

You can get a needle valve at almost any hardware store. On my Dodge I had a FASS fuel pump with 3/8 rubber fuel line. In the engine compartment I put used a 3/8 x 1/4 inch tee with hose clamps. I than ran some 1/4 inch line fuel to the needle valve with a brass fitting. I than used a compression fitting and ran the plastic tubing into the cab. The gauge kit comes with the plastic tubing. When everything is hooked up, start the engine and just barley open the needle valve. Have somebody in the cab watch the gauge and when they start to see pressure don't open the valve anymore. I takes about 30 seconds for the gauge to show the the 16 lbs I used to run on the Dodge. The isolaters they want to sell you with the don't last long when used on a Cummins engine, that's why I used a needle valve. Remember this was for a Cummins engine and I am not sure about the Duramax fuel lines. Hope this helps.