very expensive but u can make one by getting a tire hose extension for duel wheels and put a guage on it . the fitting on your fuel is like a valve steem it is a schrader valve,,, to releve the fuel pressure, so you can change the filter, with a small screw driver push in the pin in the schrader valve you should fet fuel out ,,, the only time i have ever checked the fuel presure on a V6 was if the engine is losing power on top end if u have lots of mods ( around 360 hp and up at the wheels) and u lose power then check the fuel. psi on my V8 i have a pressure guage at the regulator and can read it any time i open the hood.