Where do i connect a fuel pressure gauge on an 01?

[audiocontr]

I'm trying to track down a loss of power. Where is the easiest location to connect a fuel pressure gauge?

[greasyF250]

There is a brass plug on the back side of the fuel bowl . I threaded a cheap harbor freight oil pressure hose and gauge into it. You can leave it on and just open the hood to see fuel pressure. ( it won't be of any use while driving though)