There are many ways to do it. The easiest is to cut the wire and connect Fitech fuel feed to it and your done. No moving of the inertia inertia switch is needed (as Edwardb has pointed out). Just check the PMW and you should be good.

My 2 cents....
Relays are there for a reason... pump motors draw excessive current at start up. I would rather have to check a fuse or a relay then debug a computer in the fi system to find out a circuit is cooked.