I've got a question hopefully someone here can answer.

I'm in the process of rewiring my 1965 coupe including the underdash and taillight harnesses andalthough my car originally did not have backup lights installed, I noticed the new wiring harnesses (underdash and tailight harnesses) have the backup lights included. After reviewing the wiring diagrams, I'm wondering what it would take to install the backup lights on my car. It looks as though the signal would possibly come through the current neutral safety switch but I'm not sure. Does anyone here know how this can be accomplished?

Any help would be appreciated.