The propane tanks have a float inside with a magnet on the float arm. The gauge on the end of the tanks is magnetically connected to the interior float. If your tank gauge is correct and the light display is not then you can replace the external tank gauge without draining the tank. If the float and arm is bad then the tank must be drained to replace the float system.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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