Currently running stock hat, dual GT40 pumps, single FPDM. Upgraded wiring to 10 ga. DC 74% at 6500 rpms w/ 10lbs boost making 480 whp. I want to add a second FPDM instead of running both pumps off 1. The question is: can i just splice wires off the inputs to the stock FPDM to feed the second and run the power feeds (pin 4, and not sure which ground goes to the pump, pin 2 or 3) to the second pump. I could prob figure it out if i had a gt500 harness, but i don't. A little help would be sweet........