Black tank and even grey tank monitors can be very inaccurate. They are basically screws that with the head sticking into the tank. When there is moisture between any level sensor and the ground, it lights the LED. The problem is that any contaminant that holds moisture between the sensors will activate the LED. After some time you will be able to determine if the indicators are correct or not. There are several after market sensors, but there is no foolproof sensor yet. Best bet is to use the good judgement method.
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