saw this on hackaday just now. looks like pretty neat mod
http://www.electronics-lab.com/proje...006/index.html
basically using a magnet and two hall sensors, it figures out when you gear up and gear down, and then changes the number up and down as appropriate. re-calibrates on neutral.
I dunno though, I miss gears all the time, seems like it would be quite easy to get it out of sync.
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