I agree with the points James makes
But to add,
1)Any recent work on that hub ?
2) Just because it is 2 wire don't assume it is analog, digital active sensors are also 2 wire.
3) Some systems wont allow you to read Live data above a certain speed.
4) be aware scoping 2 sensors together using a common earth (as pico) can sometimes give strange results. I agree with using a RBT to turn wheel as this gives consistent speed for allowing exact comparisons.
aidan
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