Pulled the clock to send off to Clock Works for quartz conversion. Took a look at the dash light circuit while I've got it all apart... the rheostat on the headlamp switch had a broken contact and it was not reparable. I took the switch apart and lubed it with dielectric grease and fabricated a jumper to bypass the rheostat. I can then replace the switch at some point in the future but for now I have dash lights!