I don't understand something. Why is it a pressure gauge behind the IP is a valuable tell-tale? Don't you want to know if it's sucking too hard, primarily? I mean, what is zero pressure indicating? No differential pressure, right? It's not starving and things are flowing, right? There's a vane pump in there but not a good one I understand. So, that vane pump, when really pulling fuel is still happy at 0psi. it isn't even sucking. So what is the utility of the pressure guage? see, what happens if there's a restriction. Your diesel gels, let's say. What is that pressure gauge going to do to help you pin-point fuel delivery issues?