you have a few ways to install this thing.. on the firewall and run the lines to the rail. Orrr you can run the regualtor directly on one end of the rail.
pretty much there is 4 ports/fitings on the regulator
the one on the bottom is the return ( the black rubber line going down to the crossmember go to that.)
one can be used as the outlet into the rail. (most rails come with a "stock" regualtor placement port). You can plug that up with a 1/2" plug or with a fuel pressure gauge and just run a -6AN fitting to the end of the rail and run that back to the regualtor. (i don't think it matters which one you use, but it seems EZ to use the right one when holding the regulator to you). i put the gauge on the front one, for EZ viewing or you can also block that one up also and not run a gauge, or run it on the rail)
obviously plug all teh open ports you are not useing. If the regulator you have was purchased new, it will come with a few plugs .
and i run a gauge on the regualtor itself.
But they also sell a fitting (kinda hard to find) but it's an adaptor for the stock option for the rail. It's a 2 bolt flange on one end with a rubber O-ring and the other end is usually a -6AN that will mount right on the regulator, and you can mount it on the firewall and the return comes up and mount to the bottom of the regulator.
Then there is just that one vacume you have to run to your manifold
(dooo notttttt Teeee this thing offff)
on the top of the regulator is the adjuster , to raise and lower fuel psi.. And thats about it. Check for leaks and you good to go.
THIS IS FUELL, SO MAKE SURE EVERYTHING IS TIGHT , USE TEFFLON TAPE IF NEEDED.