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is it possible to record rear camera ?

That's what I did. Dual channel Blackvue. Wired through the headliner all the way to the back through the existing body to hatch cable loom. If you go that route, make sure you get the coax cable that has the straight connector, not the right angle one which is much harder to get through the rubber loom. The first one I did had the right angle on both ends. Tesla service destroyed my first cable by unplugging it not so gently and the replacement had the straight connector on one and which made it much easier to route.