On my Old Beemer I've had the green light on constantly because of wires tied together and clutch switch wired together and I've had them all working or one of them working. Seems I go through something with these every few years. Currently only the neutral switch works. If I had the money I'd buy a clutch switch but consider it not a necessity.
Then I should probably state that I sometimes consider lighting and brake lights not a necessity too.
Never memorize something you can look up.