I just realized I made an error in the hookup picture and replaced it.
[img]http://freon.shackspace.com/car/ecu***37;20and%20tuning/gmbcs/4portsolenoid-hookup.jpg[/img]
This is the correct explanation of how the lines are hooked up. This correctly represents the diagram posted above as well, and it was always correct.
I do not suggest this setup for 16bit ECU. It really needs the initial wastegate map to work right.