I had a little free time today to mess around with installing the mechanical fuel pressure gauge. The Air Force had installed a rubber grommet on the left side of the cowl panel (I assume for another radio antenna) so I removed that grommet and ran the braided stainless hose for the fuel pressure gauge up through that hole. I then rigged up a rubber lined clamp and some zip tie to hold the gauge in place so I can see it from inside the cab. fuel pump on but engine off: Engine started and fast idling: Engine rev'ed to 3000rpm: So, the truck does not seem like it is ever starving for fuel because, well, it isn't. Pulling grade and accelerating, the lowest the gauge will read is 3psi, and quickly recovers as soon as I lift my foot a little. The gauge needle is rock steady, unlike the electric gauge needle which flops around a lot. So, the pump appears to be putting out the pressure it is supposed to, and the problem has been the electric fuel pressure gauge. Maybe I will buy a 2-5/8" mechanical fuel pressure gauge, and a mounting cup, and install the mechanical gauge on the cowl permanently. I didn't think I would like the exterior gauge, but it is kind of growing on me.