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My v50 Sachse EI box has a dip switch for selecting camshaft or crankshaft frequency. Here is a link to the manual:https://www.gutsibits.co.uk/pr/TheShed/Downloads/SachseSaprisa.pdfI hope this helps.
Just curious as to the outcome of this post as I am getting ready to install a Sachse ignition on my Cali 1100 (electronic Veglia tach and similar coils )