how to tell if you have a "speed" magnet?

[ltmoeller]

I have a magnet reader it is a small piece of plastic film you hold up to the magnet and you can see the poles.
Tom

[Sergio]

To tell how many poles the sensor magnet has, You just need a small magnet.

Put a marking in the sensor magnet the first time the small magnet gets attracted to the sensor magnet, then without changing the orientation of the small magnet You are holding, move it around the perimeter of the sensor magnet and see how many times it gets attracted and repelled.

You should have an even number of North/South poles in the sensor magnet.

The OEM magnet has 8 poles (4-North and 4-South).

The Speed magnet only has 4 poles (2-North and 2-South).

The crack is not a problem.