There are several indicators. First, you can pretty much "time the fill" plan on about 3 gallons per minute, so a 60 gallon tank will take about 20 minutes. You can keep pressing the "status indicator" and watch the LED's go from 0/3 to 1/3, 2/3 and 3/3. You can listen to the water flowing into the tank and as the tank fills, the "gurgling" starts getting higher pitched. Finally, what most of us do, is locate the tank vent and when it starts "spitting and bubbling" you can pretty much consider the tank "full".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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