Gauges on propane cylinders are worthless as they are very inaccurate. They can not gauge how much propane is left in the cylinder as they can only measure pressure and that stays pretty consistent until the cylinder is empty. If you absolutely need to know how much propane you have, the Mopeka system mentioned a few posts back would be your only option that will really work..
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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