do you want to use CO2 or just treat it like a standard gate?
To use it as a regular/standard gate you need a 3-port solenoid, wired to the stock boost wiring. Then you can turn it on in the software. Start with some open loop tests to determine the solenoids range and make sure the boost is under control. Then you can work on the extra features.
You could use the stock solenoid and Y arrangement, but with the big wastegates its a bit of a compromise.