dash lights ? 68 valiant not working

cold as hell so I went out and put car in garage. turned on lights and low and behold the right side of the instrument panel lit up (never worked before was always the left side that worked). went back out as I pulled it in garage lol (nothing working again). I will work on it again tuesday when I am off. I have to remove the bench seat so I can get under there without standing on my head.

67Dart273 thank you. I think the orange wire may be my culprit as it was loose in the connection to the back of cluster. It pulled out the front of the connection when I removed the cluster. I will check everything you advised tues/wed. Thanks again