I also have external sensors. But since those cheap things that come with our montes require a high mineral content in the water to work...you could try dumping cheap table salt down into the tanks to see if it will do any good for you. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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