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It does not have to take a long time to calibrate a gauge. When I got my Metro, I carried a gas can and ran it below "Empty" as far as I dared (140km) This carries some risk of disturbing sediment, though. Now, I'd just go to a not-busy self-service gas station, probably with a friend to help, with the guage on "E." From there, we'd mark the guage at every gallon or 5l as measured by the pump. Subtract the total fill from the rated capacity to find out how much lies below "E," but it is not all accessable.
Given the guage response time, a friend may not really speed this up. You may want to do the initial marking on a strip of tape, and then move it up or down slightly to put zero where you want it.
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