The tip of using a reed switch is very innovative. I even had to google what a reed switch is.
And Martin’s explanation of why Scott and Velocette seems to go along well with each other is very good.
One might add that Scott used the Harold Willis positive stop mechanism.
And at one time spares for Scott gearboxes was made by Velocette (according to Rod Burris).
I eventually found some ready solution but it seemed a little oversized to fit under the tank.
But during the day I might have cooked up a plan that don’t cost me more than a couple of pounds, and do not require too much work. I’ll try to send some pictures if it turns out well. I have to go and buy some things first, although.
Thanks for the response