>>> I was toying with the idea of making a fuel gauge consisting of an
aluminum tube, with a magnetic float in it which would trip some
magnetic micro-switches at various heights along the outside of the tube
wired with some circuitry to provide a stepped resistance or voltage
output. (like the one from http://www.avnet.co.uk/touchdown but
inside-out).
Or you can buy the touchdown one from Europa pre made and ready to
fit... It's called Mod 60 and costs GBP178.50. It's already calibrated
to the tank shape and has all the necessary bits to properly seal the
tank after fitting.
Tony
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