Your Avalanche probably uses a "generic status indicator panel" that is designed to work with all the Avalanche models. There are sensors in each tank and only those are connected to the status panel. The remaining "spaces" on the panel are not connected and don't provide any status.
Your RV only has one black tank, but there are several Avalanche models with two toilets, so there would be a black tank for each. Gray tanks "typically" are provided with one for the shower/bath sink and one for the galley sink. Clothes washer waste water is "gray water" but depending on tank location and washer location, may be plumbed into a black tank, a gray tank or directly to the sewer outlet for the trailer (no tank storage for washing machine waste water).
Each model is different, often changing during a model year even for "same models", so do some exploring to determine exactly how yours is plumbed.
From the specifications shown on the Keystone website, your model comes with 4 tanks. A 54 gallon fresh water tank (66 gallons including the 12 gallon water heater capacity), a 44 gallon black tank and a gray capacity of 78 gallons, probably divided equally into two tanks, each holding 39 gallons.
With regard to status panel accuracy, the sensors in each tank are not much more than "4 nails through the plastic wall" and are notorious for false readings after they get "fouled by waste and toilet paper" so don't expect them to be a reliable source for when the tanks are "needing attention". Most RV'ers have learned to either time their dumps (every week/every 4 days, etc) or to "listen to the flushes" as the sounds during flushes will change as the tank fills, so if you pay attention, you'll know by the sounds when your tank needs attention.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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