Looking at my Dyna S, 1/4 is on the left module and 2/3 is on the right. Shouldnt matter which side of the frame you choose to mount your coils, just follow the wires or colors from the points or Dyna s to the coils,for instance, the wires coming from the left Dyna s module in the points box lead to a coil, the plug wires from that coil fires 1/4, So look at where the signal wires go when they leave the points box. Hope this helps.
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