I just installed my rail pressure gauge and now when I turn the truck off it revs up just before it shuts down. I pluged it into the fuel rail sensor first then my EZ then factory plug. The rail pressure seems to be working fine but I also installed the fuel pressure kit and I dont get any readings on it. I have a FASS so I bought some fittings and cut it into the 3/8 line and then connected the brown wire to the top of the sending unit but I cant get it to work.

 

I just checked my sender for you and my sender has a ground. Just hook up a spring clip to the body of the sender to ground and see if your guage gets a reading.

On another thread in the help forum several of us are having sender problems but usually they work for a while.