Look here http://www.lt1swap.com/underhoodfuseblock.htm
ignition power goes to a pink wire on the that black connecotr with like 12 or so wires on it, next to the blue one. And also on the underhood fuse block that link shows where it needs to go.

Water temp most use an adapter and put your guage sedning unit on back pass. side of head. there is a plug there.

I think on the a/c request you can have your programmer turn that on for a fan control wire if you run electric fans.