I want to install a back up light on my 1951 truck. I understand it was not offered as a stock item but as an add on back then.

I got the light and bracket that mounts on the rear bumper bracket but I am totally confused as to the switch and location....If any one could post a picture, part number or any info that can be helpfull to find one. Also perhaps a diagram or photo on the location...where and how does it install in the transmission.

Thank you