Instrument cluster Lights no worky on 65 Cuda

I had the same problem. Only mine went out then I turned out my high beams! I put in a new light switch, and still needed a new circuit card. It had two breaks in it. Now mine work perfect! The cards, and lack of a ground seem to be the problem usually. The cards are of pore quality. But I imagine not bad for the tec in 1965. I also added a physical ground from the card ground screw to the body of the car. Hope this helps a little.