One of the wires in the connector is WBO2 input, the other is aux input... I don't remember the wire colors, but there's a pic in the instructions. You want to use the 0-5V output of the wideband.
I'm pretty sure you have the solenoid correct, but you can test it yourself... With it not energized, flow from the Y-pipe should be blocked, and the wastegate side should be vented. If you energize the solenoid, you should get flow between the Y-pipe and the wastegate ports.

