Propane Tank fuel guage
I bought the AP products propane gauge that magnetically attaches to the bottom of the tank. It came with 3 rubber spacers for the rim of the bottom of the tank. On one of the tanks the rubber space...
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Your topic made me look into those - I ran across this on Amazon. If you look at the comments, the seller is commenting. Also, you will see others are talking about aluminum feet instead of the rubber ones. People are saying they contacted the company and they were replacing the rubber feet with aluminum feet - probably to fix your problem. My guess is they are aware of the problem. Please let us know what the resolve it.
https://www.amazon.com/AP-Products-024-1002-Propane-Indicator/dp/B01C5RQKJA/ref=sr_1_1?s=automotive&ie=UTF8&qid=1516922061&sr=1-1&keywords=Mopeka+TankCheck+LPG+Tank+Check+Dual+Sensor+Kit
https://www.amazon.com/AP-Products-024-1002-Propane-Indicator/dp/B01C5RQKJA/ref=sr_1_1?s=automotive&ie=UTF8&qid=1516922061&sr=1-1&keywords=Mopeka+TankCheck+LPG+Tank+Check+Dual+Sensor+Kit