The One Lap VR-4 has ECMlink and I want to use either the FPS or the EGR to control the water injection. Which wire does the ECU use to go to ground? I want to use that wire to ground/activate the relay that turns the pump on and off. I am just trying to make things simpler and take the hobbes switch out of the loop. Plus, ECMlink with speed density will let me control things like the rpm and boost window the water injection activates.