Hello everyone, looking for some help here!

I swapped out my 55 year old cluster wiring with a fresh new wire loom and it’s missing the wire specifically for the cigar lighter which I use for 2 things: the RetroSound radio presets and the recently added emergency flashers. Now I’ve managed to salvage the old wire for the lighter, hoping to reuse somehow and (if it’s possible) integrate back into the new fuse box or welcome any suggestions to helping me get the figured out with another way to get this fixed!

Appreciate any help!
Obliged!