Speedway 22 circuit wiring harness (reverse lights)
 

Finally back on the c10 rewiring, striping the paint and welding the firewall...but got stuck on the tail lights today.
The dogs chewed up the original tail light sockets and wiring, so no reference there. I have it all set to go but how do I wire in the reverse lights?

Any help is always greatly appreciated, thanks in advance.

1984 c10