Others have better info on removing the dash but on the knobs many in that era are of one piece knob and shaft construction. The bezel will unscrew and the knob and shaft will come out as an assy rather than just the knob removing from the shaft as was typical in later models. Headlight sw is definitely done this way but not sure what else you have that might be similar.
Here is a typical prewar headlight sw showing that construction. Pull the knob out and unscrew the chrome bezel from the front of the dash. That will let the switch drop a bit allowing access under the dash to push down on a small strip of spring steel to release the bent end of the shaft from the sw tongue. The assy can then be removed.
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headlight switch 1.jpg (65.53 KB)
headlight switch 2.jpg (80.95 KB)
headlight switch.jpg (61.05 KB)
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