In Reply to: Extra Hole on the Dash posted by Tony Sanchez (OR) on December 13, 2017 at 01:55:29:
Your question is a valid one. Over the years farmers would do some strange things to their tractors. Adding a light switch is one very strong possibility. Is it about 7/16" in diameter? That would be about the correct diameter for a switch. If it never had head lights, maybe a rear work light.
The search for the correct answer is probably lost to history.