Wow!
Thank you very much John, so very kind of you to help out!

The gear runs right of the crank, it sits on the flywheel cover.
The flywheel turns counter-clockvise (same direction as the front sprocket)

The tacho has a 4-1 marking.

Maybe this also means something:

Bottom tacho:


I would also need the cable if he can supply.
Thank you very much again!