https://transportevolved.com/2015/05/05/third-party-apple-watch-remote-control-app-for-tesla-model-s-on-its-way/ How good is this! It really showcases the tech available in the Model S
You might be better off looking at this Tesla Model S car fully controlled by Apple Watch - YouTube You should also follow the thread Tesla - Apple Watch support If you go deep into the thread you will see a lot of discussion of the app I posted the Youtube link for.