My (partially completed) experience
I am having the same problems, I have the D180 harness with the Skyview upgrade. All I want to install is the AP Panel, but am running into problems finding installation instructions for it.
I also have the Skyview upgrade, and was a bit dismayed to find out from Van's that the AP and Knobs were not supported. I found, however, that things seemed to work OK for me (though I haven't got up in the air yet):
1. Cutting the holes in the center panel was no problem--everything fits--not sure if there was ever any problem with that.
2. I unplugged the existing autopilot Dsub from the magical black box. This thing is hooked into several different spots via the conversion harnesses. The old/existing Dsub I just tied some tie wraps around so that nobody would attempt to plug it back in--didn't seem worth the trouble to attempt to strip things out from where it is all connected.
3. I removed and added the wiring to the switch and AP disconnect button to the new harness.
4. I had spliced power to the cabin light to two wires feeding the AP disconnect button light in the old wiring--I removed this from the old wiring and spliced it into the same wires feeding from the new Dsub to the AP disconnect.
From all my studying of the different electrical diagrams, it appears that all the right connections are still being made. My "ground flying" of the autopilot--turning the AP on and seeing what happens--has the servos wiggling slightly for straight and level flight, and, as expected, if I change the heading bug, causes the controls to go all the way to the stops because the plane isn't really changing any direction while parked.
Not being back in the air yet, I haven't got everything completely tested. Hopefully there will be no surprises. If anyone else has studied the problem and found something I've overlooked, please let me know.