temperature

On the rear harness there is a brown wire with black stripe that is for engine temperature to run the fans (I have the wiring diagram from Blas, just not with me right now) is this sensing temperature from an engine block temp probe or a coolant temperature sensor located in the intake manifold...

I am using an LS3 as the basic motor, but using the Holley Dominator engine control system because it will handle dual throttle bodies. I need to order a coolant temperature sensor, but wondered if there is a specific feature or model I should be using. It may be a question for Holley, but I...