OK I get it now. But, looking at the picture below I see that I have two gray tanks and one black tank. I messed with the switch and put it on BLK 1 and BLK 2 and I get a light on both. I guess it doesn't matter where that switch is on? I get the same reading.
Questions: do both gray tanks fill up at the same time?
Are they connected?
In the picture below, what do the blue levers do?
Thanks, trying to learn this 5th wheel inside and out!
Dave