Between Lift Pump and Injector Pump, that's what I figured, thanks guys!

 

Sorry to be a pain in the but this is my first cummins. So there's a banjo bolt between the injection pump and lift pump where I should put my sending unit? Could I get a pic ? I really appreciate all the info. I'm just a little confused cause one was referring to a 2nd gen but I have a first gen thanks

 

Same bolt. The bolt is the one at the top of the fuel filter with the bleeder screw in it. Replace that with the pipe tap banjo bolt and then rig a line to your fuel pressure sender. It's best not to mount it right on the engine because the vibration will wear it out rather quickly.

 

So I need to go buy a banjo bolt and run a hose attached the sending unit for the gauge