I would think you need the stalk down in the intermittent position, and then adjust the potentiometer, where i guess fully anticlockwise is as previous, and turning clockwise reduces the time between wipes.
You can do without the potentiometer and just install the VW/Audi/Skoda relay for about $35. You then set the time interval by moving the stalk in a sequence, the timing of which 'programs' the interval until the stalk is returned to neutral again.
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