According to ETB:
http://www.etbinstruments.com/FAQ_Gauges.htm#Q1
Quote:
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This sensor is calibrated to provide an electrical resistance of 260 Ohms at empty and 20 Ohms at full.
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Isn't there a "simple" way to turn a light on when the sender is registering 230 Ohms (approx an 8th of a tank left, which would be about a gallon IIRC on a sportster tank)?