R23 Holding Tank Sensor

I have a 2019 R23. I see in the wiring diagram where a 1amp fuse protects a holding tank sensor. But what is it tied to? I dont see a light or gage any where. I saw an old post with a same question....
The holding tank level gage is not registering on my 2025 R29-CB, it constantly show "empty". The tank is 3/4 full, verified by a stick inserted in the vent access hole.
Is there a fuse for this? Is there another common reason for this? Thanks.
 
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