Posted this in electronics , but maybe someone can help me here.
 

I just purchased a cateye strada cadence rd 200 for my Surly LHT and I am mounting sensor and magnet on rear. Does the gap have to be less than 3mm like the instructions say? Even with the spacer they send with it the gap is way more than 3mm. Should I just keep using more spacers? The seperate cadence sensor on crank is still more than 3mm but should be easier to adjust to get closer. Any ideas and did anyone else have this problem? If it works with a wider gap should I just leave it as is? Or does that throw off calibration?:mad:

My Astrale had the same problem. Fixed it with pieces of inner tube under the mount as shims.