MK2 S (late) with 2 speed wipers had a special toggle switch for this. It has 1 more terminal than a headlamp one. Sorry, I don't have its part #...
We have a 2 speed motor in Barney, using a headlamp switch, but the park doesn't work. Doesn't bother me, as I ran an 850, they didn't park anyhow!
Note if fitting a Clubbie motor to a Mk1 with RH park wipers- if you don't change the wheelboxes to later type (somehow), the wipers will sweep a full 180*....

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
