looking for way to determine position of magnet through thin plastic Digitally

I am looking for an easy way to determine the location of a magnet through a 1/16 thick piece of plastic. This possible locations of the magnet will be
in about a 4-5 inch linear distance. I need to then report proportanaly where it is digitally to a basic stamp. What i have been conisdering is using 7-8 hall effect sensors which will give me the 7 or 8 levels of the magnet but i'd prefer better resolution or a method with less components. This is for measuring the level of fuel in a tank that can have nothing passing through the outer wall. Any suggestions are welcome.
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a
be
an interesting project. perhaps you could use pickups with analog outputs that would give you a reading proportional to magnetic strength. this would give you a means to approximate the float level between any 2 sensors.
is the tank fixed in place? a vehicle mounted tank will add compications.
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Have you checked the Banner Engineering Catalog? Edmunds Scientific Catalog? Balluff Catalog, IMF Effector Catalog? There are many commercially available solutions to your problem.
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Anthony

You can't 'idiot proof' anything....every time you try, they just make
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