I'm reinstalling the restored gauges and dash panel in a 1959 GMC 100. I've got about everything connected except the single wire that attaches to 12+. I see the Gray wire coming out of the headlight switch that turns the parking lights on that's where I need the back gauge panel lighting to come on- with the parking lights and headlights. Where would I physically connect the gauge bulb 12V+ wire to that? I can't seem to remove the headlight switch to get a good look at things and maybe strip a section of wire to tap into. There is supposed to be a "button" on top of the switch to all removal of the knob, but I can see (with a mirror) and feel that there is no button there to be found. Anybody ever come up against this problem? Thanks