It's a single wire with a brown (I think) connector sticking out of the wiring harness near the powersteering pump. Running a positive wire to it will trigger the fuel pump. It can also be used to trigger an aftermarket relay for a hotwire.
Are you really using a double pumper or just a hotwire kit? A single Walbro 340 pump will go deep in the 10s. Our stageII car has a double pumper and it's a bit scary knowing if that second pump doesn't come on the motor is toast. It's overkill for 99% of the stock block motors.