There are literally dozens available online from pol add on gauges to strips that mount to the side of the tank. I just pour warm water down the side of the tank and where you see the cold line is the propane level and it’s free. Replacing the manifold connector to an auto transfer connector is a safe move as previously stated. Whatever you buy don’t buy from a RV Dealership. Use EBay or Amazon to get your monies worth.
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