Dash lights will not turn off!! 72 dart

Sounds like it might be in the switch.
Dana has disassembled a switch for repair and posted photos. edit Found it 67 Dart Headlight Switch Demystified
Removing the switch is a bit of a pain.
Need to be able to hold the side button so the shaft with knob will pull out. Then unscrew the nut (there's a tool or you can make do with a snap ring or needle nose pliers. Then unlip the wiring connector.
Thanks again for the information everything was normal till I was about to leave the car show and the dash lights were stuck on again, it's just odd that it's so randomly happening tried twisting the nob again no change so once I got home I pulled the fuses and no change, going to get the instrument cluster out again and pull the switch off and check it over along with the wiring next