Just run from the box. Find a ignition live or use the accessory fuse and run a switch on/under your dash. Fuses should be according to the link but never assume nothing has been changed in the last 40+ years. http://www.ratwell.com/technical/Fuses.html" onclick="window.open(this.href);return false;
Cheers aspro, everything is pretty stock thankfully, except the ignition switch.
Should be able to hook up to the accesory fuse and use a spare switch I have.