Where does the fiber optic cable go???

[greybeard360]

Working on a basket case in my shop. This thing barely had the body on the frame when it got here and I had to remove the body to get it painted.

Now..... The truck is nearly completed now with just of the few minor things to work out. I went thru the steering column, had it painted to match the truck and have it back in it home. I put the fiber optic cable into the back of the shift indicator but I have no idea where it gets it light source.

Help me!!!!! (small fly imitation)

Just one of the small things I have tried to research and can't find the answer to it anywhere.