No problem, wiring is scary at first. We are always glad to help a DIY person. Looks like you have quite a collection. Lots of wiring smile
12V is a good idea. A prewired fuse panel is a must. It's a good time for Alternator. Are you hip to ballast resistor and a new coil, starter side terminal, etc?

Yes, you will need a voltage reducer for an original 6V gas gauge. Don't know why 46 is not included.


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn