Streaming BT from phone is working!
It is in the A2DP app. Initially the stream was choppy but in a couple minutes it got really good.
Illumination of buttons works. No dimming with dash rheostat but that's ok by me.
Steering wheel buttons all work. Talking head goes to phone page.
Edit: The unit apparently has two level dimming NIGHT and DAY. There is no dimming wire to connect to the vehicle circuit in this GA6166 configuration. I don't know if the dimming is GPS time/position sunset based or if there is an actual sensor in the unit.
Mike