Paging Midlife; Backup lights flakey

Where in the heck is the Backup light switch?
The problem I have is the lights “flash” as I transition gears, however they do not stay on when in reverse. I’m assuming the switch is out of adjustment.1969 base with a FMX.

I belive it is incorporated into the neutral safety switch.

Yes, it’s the arch shaped switch at base of floor shift, and the shop manual has detailed instructions for adjusting it.

I just fixed mine. automatic c-4 and switch is on transmission. very easy to do!

Thanks, guys. All on the right track.