I have a 24v Cummins 5.9 engine, and am mildly spooked by the horror stories I hear of a bad lift pump burning up the injection pump.
Here's a photo of my fuel filter. It appears that they added an idiot light sensor (the conical widget with the green connector in the center of the image). Seems I ought to be able to put in a "T" fitting and run a line into the cab for a fuel pressure gauge. And that it could be done with the help of some brass fittings and some teflon tape from a well-stocked hardware store. And it seems, too, that a good time to do this would be while I was replacing the fuel filter.
Bonus question: anyone know how the green connector comes off? It has a red slider thingy but retracting it doesn't help.