Bingo !
We have a winner.
Yes, this is exactly what it does and operates.
Only thing is, one answer leads to more questions......does this then operate the clutch ? it seems a bit odd to have an electric clutch and a second system or clutch ? I always was curious as to why tractors have electric PTO engagement anyway, this seems suited to say a AC compressor clutch, but not to things like say mower blades or things that could have a high load.
I guess what I am saying is the electric switch seems to be optional when this lever exists ?
And this is also another reason manufacturers should make freely and easily available owner operation manuals.