I guess I'm more inclined to the nautical than old english, but either way an impartial verdict is all I ask
edit: I checked over my math last night and it is correct, so I'll close off the question and leave this for anyone who wants a cadence meter but doesn't want to buy one. An $8 walmart cyclometer works fine.
In summary the magic number is 1667 with the kmh setting. You'll probably have to splice the wire to lengthen it. Sensor on chainstay, magnet on crank arm arranged to just miss the sensor and it works like a charm!