I'm someone...
Sorry, I don't have answers for you, but...
It would be really tough to gauge the gauge of the wire. I'd say only the source of the wire knows.
For the resistance, that will vary even with a given number of wraps. Use a multimeter. If you don't have one, get one. Required equipment for rebuilding. Always check your coil before putting it on a PV.
Not much help, huh? Sorry.
thx for the help