For the gray tank, if you reach full it will back up in the shower.
For the black, take a flash light, push the foot pedal on the toilet and look down the hole.
Don't feel too left out with no indicators. You learn after enough camping when you will be approaching full or close to it. And then there are many with tank sensors that they do not work well or at all. They need to have a good clean system for the senors to work correct. Paper and junk short the probes out. Sometimes they never shut off and the tank is empty indicating full or part full.
Happy camping in your new camper
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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