Black tank gauges never work well as stuff sticks to the sides of the tank. With a single black tank - tank 1 shows the tank you have. Black 2 is not functional except on rigs actually outfitted with a second black tank. If you only have one head, you should only have 1 black tank.
If you flush and rinse your black tank well the indication will be better for a short period. When we are out, I dump and rinse out black every 7-10 days regardless of what the indicator says.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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