> However a sensor designed to count gear teeth may well be better
> than the inductive sensor I suggested.

Here are some extracts from the A3046EU - A3058EU data sheet
er, (c) Allegro btw so no printing this out and selling it please

The AE3046 blah blah Hall Effect gear-tooth sensors are monolithic
ICs that switch in response to differential magnetic fileds created
by ferrous targets.........When combined with a back-biasing magnet
and proper assembly techniques devices can be configured to
give 50% duty cycle or to switch on either leading, trailing or both
edges of a passing gear tooth or slot..............on-board regulator
permits operation with supply voltages of 4.5 to 24V The output
stage can switch up to 20mA at conservative specified repetition
rates to 20kHz and is compatible with bipolar and CMOS

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