Fuel pressure guage

[rtadams89]

I want to add a pressure gauge after all the fuel filters to see if I am getting the expected pressure. Looking at the LDS Troubleshooting guide, pages 12-13 give the expected pressures and a location to put a gauge at, but the picture in the PDF I have is so bad, I can't see where it is connected. I plan to just put a tee between the output of the filter housing and hose running to the inlet of the FDC. The pressure there should be between 30 (minimum at idle) and 75 PSI, yes? I see the fitting there is part number "89-LB3/8x3/8", but I can't find a reference to what size NPT fitting that part has; anyone know so I can add a tee/gauge?

 

[cattlerepairman]

I think it is simply put in place of the bleeder screw of the secondary filter housing. I'd venture out and say it is probably 1/8 NPT, so a gauge would screw straight in. Sorry, don't have my truck on hand to verify.