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You have to get the hall effect sensor within less than about 1.2mm of the magnet as it passes otherwise it will not read. Post up some pictures. Also try testing the speedo off the bike by powering it up and then just waving the magnet in front of the sensor to see if the system is working correctly.
 

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spotted your problem right there mate. When you test it wave the magnet at the side and then the end and see if there is a difference. you need to position the sensor like this:

Technical drawing Diagram Line Drawing Circle


Hope this gets you up and running!
 
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