TorkLift sells a wire harness that plugs into the connector and works without any software modification. I tested the pins with a multimeter when I had the bumper cover off, and they have 12v, so you are good that way. I say standard because the connector is the same as the ones BMW uses on some cars.
Looks like a Tekonsha 119250 light kit. Instead of splicing into the various lighting wires, it uses current sensing switches so that it is completely isolated from the stock wiring. I installed one in my Bolt EV and it works great.
The only thing is that you still need to tap into a 12V source and ground or run a separate line to the battery as the instructions state. Ground is easy to get anywhere there's metal.
Don't get me wrong, it's a good kit at a decent price, but in no way does it directly plug n' play into the Tesla wiring harness. Plus, the 4 current sensing switches (left, right, tail, & stop) are kind of bulky as a whole, so you'll need to find a place to put them before putting the bumper skin back. They come with foam sleeves so they don't go click/clack if they go bouncing around, but a Tesla-specific plug n' play harness would be ideal.