So in the Celica I've used a Pioneer Appradio which mirrors the Android interface on the HU, this worked great but was not super stable, still having Android in the car is so much better than the OEM Toyota Radio, which is slow with outdated maps...
For the 86 I went a different route, a Chinese (brand=Joying) HU with Android 5.1.1 2GB Ram and Intel Sofia CPU, I added a 4G dongle, Toyota harness and USB converter, all from Joying. I've wired in the OEM rear view camera using a 12V to 6V step down. Torque works too, using a cheap ELM327 ODB2 adapter , this allows me to constantly track the oil temp etc.
Video
[ame="https://www.youtube.com/watch?v=2MVxv7t-3jw"]Joying HU in Toyota GT86 with 4G LTE 2GB - YouTube[/ame]
