Wisch-Wasch-Intervallschalter

Hello fellow Ro80 friends!

I'm sorry for writing in english. I want to ask for an advice.

I have an impulse gebber for the wipers interval (the part n30 of the sheet n81 as you can see in the picture attached).

I looked around on my 1968 car but this item is not mounted anywhere. In fact, the intermittent feature doesn't work.

Can someone help me and tell me where and how to mount it?