68 Barracuda clock adjuster cable - where does it go?

It points down through a hole near the fuse box. Maybe the factory drilled a hole especially for this but I didn't. I used a hole that is there in every dash.
I then wondered why there never was a bezel like MAP LIGHT and TOP that reads CLOCK ADJ.
Then I took the clock out and sold it at a lose. It was about the dumbest purchase I've ever made.
I set the battery cable off while the car is parked for weeks at a time so the clock was never right. Adjusting the time also adjust the clock making it run a little faster or a little slower depending on which way its turned. This allows a daily driver to calibrate the clock so it does stay close to accurate. I figured I would eventually kill the clock adjusting on it.