I have this on my truck and it has worked well for me.
Pearl - No New Car Required and it is solar powered so it recharges itself every time it is out and about with available sunlight. Should the battery get low due to a garaged vehicle for a while, the frame comes off easily with the special included tool and connects via USB for recharging. It does require use of the vehicles OBD port because it creates its own wireless wifi network connection and uses Bluetooth as well. With the use of an App, it turns your phone into the backup screen. It's pricey (but you can find bargains second hand) and lots of other technology has evolved since this came out a few years back so there are many options out there. Just wanted to make you aware this has worked well for me to date, I can see that this could be attached to the TD as one option, I can easily swap it from my real license plate on my truck and experiment over to my TD and will let you know how it works out.