More updates!
Today I received the soldered box, to my surprise he had also reheated the solder on all the big contact points.
Tested it by just hot connecting the wire and the blinker handle switch. IT WORKED ?
I then used a two way cable shoe/connector (too tight for a solder connector) and taped it off and tested again to make sure. Now all that is left is cleaning the dust out of the air ducts and re-assemble the dash. ?