Sorry to revive this thread, but it's the most relevant to my question, and I suspect that there will be others with the same question soon: I'll be replacing my Leaf with a Model 3 sometime in the next few months, so I was thinking of replacing the J1772 on my 30A EVLink EVSE with a Tesla connector. I see Tony is still selling them, and they have a few inches of cable intact. For power and CP, I'm guessing cut off the J1772, and crimp the leads in the existing cable to appropriate ones in the UMC connector. The UMC connector should already have the proximity pilot resistances, right?
My question is really around adding a 3.3v supply for the charge door transmitter. It seems it would be more elegant to do that inside the EVSE housing, rather than by adding a battery pack where I splice the cables at the car end. Has anyone tried that? There should be plenty of room, and I'd probably still go with a battery rather than trying to rig up a power supply that would have to be powered off another branch circuit and routed into the EVSE.