68 Camaro, Ok guys still having problems.
Here are things I tried. Put in new turn signal stats, Put in new grounds for the front and rear turn signals, Replaced all the bulbs, replaced the headlamp switch, Cleaned up the fuse block and replaced all worn wires. And replaced printed circuit board on the guages.

Problems: when using the dimmer switch and turning the knob, my turn signal indicators light up in the guages.

Also I cannot get the guages to light up. Even putting in the new bulbs and circuit board.

Please help if you can. Thanks

Never mind, I found my answer. My service manuals have arrived. In case someone has the same problem. Make sure you have a ground wire going to the back of the instument panel.