Reading more, that single brown wire from Tilly is probably my voltage from charging block. I’m wondering if that black wire on the big connector from old and busted is just a ground wire (suppose I need to go check it again).
If that is so, I should be able to re-use that big plug and just add the ground wire. Then I need to check out that coil on the Tilly and see if I can wire it up like old and busted. EDIT: So the wires going to the ignition coil on the old and busted appear to be a kill wire and a ground. The Tilly just has a kill wire, apparently it is case grounded and not a floating ground like old and busted appears to be. So again, I think I can reuse the connector and just add a ground wire to the block.
Then I could just plug and play the electrical stuff. Hopefully someone with more experience can steer me in the right direction.
Tilly wiring schema