IIRC;
Mount the device somewhere close to the fuel rail,
Remove the OE fuel regulator from the end of the fuel rail and repalce with the adapter part that comes with the PBV,
Connect the small vacume pipe to the top of ther PBV and the other end to the appropraiate connection of the metail tube than runs round the rocker cover (youll know which one as the OE regulator is connecte here too),
Connect the OE fuel reg replacement adapter to the side inlet of the PBV via fuel pipe,
Cut the return to tank fuel pipe on drivers side of the fuel rail (get the right one!), block up the side coming from the fuel pipe with a clip and bolt, the connect the open side (going to the tank) to the PBV boootom outlet.
As for setting up, they come set reasonably well. If you wan tit spot on, take it to a RR or else buy a fuel pressure guage so you can tweak the pressure by T+E
Hope this help
Connect the bottom PBV outlet