If you just want to check the fuel psi. If you have a local diesel shop that does fuel systems. They should have a OBD scanner (or similiar) to h/u to check the idle and wot pressure.I want to hook up a fuel pressure gauge to my truck and see what the lift pump is pushing out for PSI. Is there a shrader Valve somewhere I can check it off of? Or were is the best place to check it from?