I must say this unit does feel well built. It seems the canbus adapter plugs into the obd port on the car. Please let me know if you find out another way to plug it in.So I put the wiring harness together. its easier than the instructions make it look (which some of the photos are not even a Tesla).
There is a can bus decoder that plugs into the Canbus and that goes to the main harness, i suspect this is where it detects the remote or the touchscreen opening the liftgate.
There are basically these inputs/connections to make:
1) Fuse box adapter - splits a fuse ( I will have to find one that is 'Live' when the car is unlocked via the remote, not sure which fuse I can tap into as there are no instructions that call that out and I'm currently already tapped into two for Artsci's T and for goshers blind spot detectors alreadys)
2) Ground wire
3) Canbus Adapter ( I assume this plugs in under the main screen?)
4) Power switch to install on rear lift gate handle
5) Plug that connects to the OEM rear lift gate lock
6) Left strut cable (Yes both are powered struts)
7) Right strut cable
So other than routing the harness from rear hatch to frunk, the other connectors look fairly easy once i figure out which fuse to tap.