I modified the
MK2 GOLF PARTS / Wiper Speed Controller.
This is the original edition.

Cut the rod of dial. And painted nut and washer black.

I used the VW Valve Cap for dial.

Finished!

Installed!

As I informed before, we can use this controller when the position is "Interval mode". And we can get the interval from 1.5sec to 20sec.