Waste tank sensors are notorious for being inaccurate. I haven't had an issue with the fresh tank sensors (if you can see check that they are all wired up). (This is usually because the waste tank sensors get fouled up quite readily but there really isn't much to foul up the fresh tank sensor--if there was it wouldn't be fresh water LOL.)
Our fresh tank is white and semi-translucent. I usually put a flashlight on it with the light right on the top of the tank to see the water level.
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