I can say that mine seem to work so far. After emptying tanks all three read zero. I will never have to empty that second black tank as I don't have a tank just the gauge.
. Hope they continue to function correctly as time goes by. I just need to have my tanks empty quicker. Never more than a third full flow in the clear elbow. Back to bad readings, I like to leave some liquid in the tanks on the way home every so often to let it slosh around and hopefully clean the sides and bottoms of the tanks.
Tom Marty
