1971 duster 4 speed reverse lights doesnt work

picture of both the switch and harness for manual transmission.

http://www.brewersperformance.com/products.asp?cat=84


There is no harness going from the reverse switch on the tranny to the firewall. Funny but weird. Okay so a wire should go over bell housing and up towards firewall. Will check that first thing when i get home.

Thank you