My plan is to swap guts of polar tender to std tender
Is that round sensor a magnet?. Need to ream to fit on std tender axle.
Or would it be better to make a sensor. I have round nylon.. Then glue a small piece of magnet to it
Thanks...
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A reed switch and a magnet is probably the easiest route, trying to remove and ream out that ferrite magnet will almost surely result in magnet pieces on your workbench. 
Thanks john. I will see how that board is wired..
My other thought is to use the 0 ga axle and fit it to the std axle. Cut drill..
IF that's a once-per-revolution magnet/sensor seems you could use a Neodymium (Nd) cylinder type magnet which come in quite small sizes. Then you wouldn't have to pull the wheel off the axle. Just clamp two half-circles of your nylon round around the axle and insert the Nd cylinder like a set-screw.
thanks, stan,
I think it is, it's for chuffing, it also does the brake sound,
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