Don't use sealer on the boss side of the adapter, teflon tape on the pipe side.
I don't imagine the 12V sensor will work, but I don't know for certain. Your going to be making a bracket for it, too. I can't believe they don't have the bracket anymore.
Tone ring should have come with a spacer and new balancer bolts. If it didn't come with that, I'd send it back. $200 for the tone ring with no spacer, bolts, or sensor bracket is crazy. The spacer I received had a recess to mate with the nose on the crank and it had a nose on it to mate to the tone ring to keep everything true.