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It was empty. I never used enough water since I was fighting a leak in the pressurized pipes at the same time. I'd find a leak then stop the pump and work on the drain. It wasn't until I brought the hose into the coach to test everything out.
And I don't think my level sensors work on any of the tanks.
FWIW you might want to figure out what drains where. I have seen or heard of dumping all bathroom fixtures into the black tank as well as dumping any other combination but the toilet into the gray tank.
In our case I think I maxed the black tank last week when bubble of air started coming up the toilet as the hand basin drained. Shower was fine so now I know how to check limits there. ;-) The limit was expected to some extent as I had prefilled with a couple of jerry cans of water and detergent to soak the tank contents and clean the probes. Worked as in the tank stopped reading full all the time after I dumped.