adding reverse lights

gents,
can't find any threads on this exactly so here we go. anyone ever add reverse lights to a 65 v-100, 225, auto 3 speed column shifter? new sockets and bulbs installed, the purple wire goes from the bulbs to the connector behind the driver side kick panel but it ends there. no wire meets it from the other side. clearly i have to add wire but where does it come from?

and where is that damn "back up light switch". what am i missing?

cheers and happy sunday.


jp