I've got an older Sigma Sports BC 1200 computer. If I have it hooked up, without the sensor or magnet on bike, and wave the magnet past the sensor it reads, but once I zip tie everything up, it stops reading. I called SS and they're sending me a new cadence kit so we'll see how that goes. Has anyone heard of this? I have A '99 'Goose Pro Ti frame and Dura Ace. The front wheel sensor works fine and the cadence sensor/magnet are practcally touching! What gives?