Steve,
I picked up a Velo bike computer after seeing yours.
Can you shoot a few pictures detailing how you attached the sensor, magnet and mount?
Also, what size tires did you program it for?
Thanks!
Check these threads.......
http://www.mtfca.com/discus/messages/118802/141154.html
http://www.mtfca.com/discus/messages/257047/285228.html?1335921782
http://modelt.org/discus/messages/2/35421.html?1327099548
When I installed my speedometer I hadn't seen it done and was inventing my own sensor setup. If I were doing it now, I'd use Dan's and Craig's method. Mine works, but theirs is simpler. I don't remember what number I used. I just put a string around the wheel, measured the length, and entered the number in the computer.
Thanks!