Here is a picture of a typical PMO fuel pressure regulator (FPR) install. This happens to be on a 73T:
The bottom line on the side of the FPR is the supply line, the top line is the return. The ports on the front (covered with blue tape) go to the carbs. The pressure is set to 3-4 psi by adjusting the needle valve on the top of the unit. The needle valve is basically changing the orfice size on the return side to create the desired operating pressure.
This is just one of many ways to do it, but what is stated above is what PMO recommends when installing their units.
Hope that helps,
__________________
-Doug
1968 911R Clone; 11/07-?? (forever the project car
)
1978 911SC Midnight Blue Metallic Coupe; 7/05-11/09 (so long impact bumpers)
1973.5 911T Sepia Brown Coupe; 9/98-8/99 (went to a great home)
1973.5 911T Gulf Orange Targa; 5/97-11/02 (went back to Germany)