I had a non-working pictorial pilot in my plane. So the wing servo and panel slot are already there. Not to mention the wiring of the PP. In my mind, that removes a lot of the wiring guess work, at least in terms of how to send a signal to the AP and turn it on and off! I am hopeful that I can just pull that wiring off the PP plug and add it to the Gemini plug. Looks like I may have to extend some wires because the Gemini doesn't stick out the back of the panel as far as the PP. I also have to swap the fuse for a 7.5amp I believe, from a 5 amp version.
I have zero experience as a builder and have never wired anything in a plane before. But I ordered the appropriate length and gauge of wiring from Stein, as well as any other hardware I would need, and tools. He and his people knew exactly what I needed and made me feel a little better about the install. You may have a solution already, but it was nice to have Stein twist me up a few wires of the appropriate gauge, into a "harness." I took a good look around the floor area at my condition inspection this month to try to figure out how I would route the wires to the panel. I don't have the answer yet but I have some ideas now. I've just been intimidated by this and dragging my feet since around March.
So I hope to start with the servo mount (pitch), then worry about getting the wires past the spar, and finally, wiring the Gemini. It is the first two parts that have me nervous. I don't have to take the plane out of service to do the latter.
Sorry for the long story. I was just trying to convince myself I have a good plan! I think you are correct on the static and pitot lines. And I think the servo wires were 20 or 22 for the signal, and heavier for power and ground like you mentioned.