Adding an amp and sub in your vehicle is not to bad of a process , but not without its potential challenges. This video shows you a typical installation and the tools needed ,ill do 3 different cars
xf/XJ /F-TYPE https://www.dentechmods.com/ part series how to do it
Tesla screen found here
https://www.dentechmods.com/https://wwhttps://www.dentechmods.com/w.dentechmods.com/
){kind=link}
When installing your amp and sub did you have to connect to the back of the tesla unit at all.. or just where you connected the amp?