I've been snoopin' around trying to find the best setup for a new skool speedo on my bike. Just scanned a wiring diagram that may be useful to someone out there.
Click the pic to see it larger...

http://24.113.193.215/bike/wiring2.jpg (http://24.113.193.215/bike/wiring.jpg)



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keep it rubber side down....
http://24.113.193.215/bike/rear.jpg