I've tried that one before, to lazy to do it properly.
You'll keep knocking the sensor and eventually have to bite the bullet and swap it over. It is no hassle to fit it onto the chain side, unless you have fancy chain guards, or a lack of clearance.
They are normally polarised, try pedalling backwards.
If for some reason you can not fit it to the chain wheel try swapping the magnets, use a good glue.
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