Thanks for the reply; more research basically came up with somes a do and somes a donts.
Just seems weird they would have a pin labeled S and not supply the sensor.
Oh well, at least I just installed an new Theralright SI-97 and a paniflo 92mm, and this weekend I am going to cut by case up to put in a 92 paniflo exhaust to replace the loud 80mm I have there now.