i bought a brand new aeromotive fpr with gauge and to be honest im not completely sure how its supposed to hook up.

i know i need to take my stock one off the fuel rail, find a fitting that goes into the back of the rail. run a line from that to one side of the fpr and block the other side off, then run the return line out of the bottom. question is, wtf can i put in the back of my rail that compensates for the lack of my stock fpr being removed?