Fuel Pump Wiring

I've replaced the FI on my son's '76 280z and replaced it with dual SUs. Probelem is that when I removed the FI wiring harnes, I lost the fuel pump relay.

I had been given some earlier advice regarding new wiring for the lower-pressure pump I put in, but when looking at the wiring schematics, it seems to me that the 4-pin connector under the left side of dash, which has connections for the fuel pump, ignition switch and ignition module, would be a better way to address this, perhaps with another relay.

Now, to my point, are there any sharp folks who 1) could offer guidance on this approach, and 2) wouldn't mind checking the changes before I try them?

Thanks in advance for the help

Peter