Your fuel gauge will work as normal. Unfortunately there is no way to calibrate the distance to empty readout when a larger fuel tank is used on GM trucks. Because the bottom of the S&B tank has a greater surface area, there will be a greater fuel reserve when the low fuel indicator comes on.
Your truck may momentarily think there's a fuel indicator/float error. When the truck thinks there is a problem it will drop the gauge to empty to get the driver’s attention. High capacity fuel tanks may cause the truck to think there is a problem because the fuel level sensor float arm moves slower than stock. If this happens, the gauge will return to its normal position after restarting the engine.
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