Dash Lights, Carb, Radiator issues

Yes! Maybe that is the problem because when I open the door the interior light goes on but when I shut the door and turn the headlight knob the interior light does not go on. So do I replace the whole switch or is the dimmer rheostat a separate part? I haven't got that far into it yet.
Also the dash panel is still in place. I didn't take it out. None of the dash lights work at all except the little bright light indicator that I don't believe is on the same circuit.