hi, can you please share which
" switch module " did you use?
https://www.amazon.com/gp/product/B00J6W8D0C/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 this item is all I can find, but it was DOA, because the Dial selector doesn't have a nice " click sound " when select A or B. Will return it and try another one...…..poor quality control.