I ordered the exact part in the link from RockAuto. I might switch out the fuel pump with a Walbro 450 pump that I already have that is capable of PWM. I would use the fuel wire from the fitech and wire it into a solid state relay if I go that route.
From what I understand if you run a relay to your pump you need to keep the fuel pump setting at 100% if not the pump may shut off totally. I could be wrong but I would look into it before putting in a relay with the FiTech.