If I understand the Holley info correctly, and hopefully I do since I'm dealing with a similar situation, the Sniper will output a (-) ground signal to activate your fans. On my car, and what I think is a typical setup, the temperature switch is between the chassis ground and (-) post of the fan relay. Once the temperature reaches setpoint, the switch closes and gives the ground path to the relay. The Sniper has two wires you can use, the blue & light green, either of which can be used to give the same ground path to the relay. I think there is a YouTube video that shows how to test it by lowering the temperature setpoint below ambient in the Sniper controller to see if the fan starts. All that said, I'm no expert either, but I think that is all there is to it.