The fuel sender works by supplying a minute amount of precise power to the outer aluminum tube of the probe. The amount of this power is indicated into a second conductor inside the tube (and insulated from it) depends upon the resistance values of the mediums separating the two conductors. A microprocessor in the head of the probe measures the induced potential, amplifies it and sends it to the gauge. As the amount of fuel in the probe decreases from burn off, the amount of air increases, thus continuously changing the amount of power being induced. For use with Westach 240 ohm gauges.
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Here are the sender specifications: capacitance fuel level sender 12", 3" bendable section, may be cut to 7.5".240 omh, 1/4" OD, 12vdc, 3 wire.