you are looking to put your manual boost control in right.
it should go in between the line that goes from your wastegate to the T.
so in the line you have labeled WG, cutt that and put the boost control in the middle. thats how i understood, and thats how i have mine so far.
I’ve been told that you should give the boost controller it’s own vacuum source that isn’t shared with anything else because they leak a bit by design. That could possibly cause issues with your BOV opening at correct times if you source them together. I dont know how big of a deal this is, but I had several people tell me this, so I listened to them.