Originally Posted by IntervaleII
You mat want to try Wema Guages. Very reliable and reasonably priced. They also have a good tech department. They have a facility in Ft Lauderdale.
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Our WEMA water sensor/gauge reads full when full, almost empty when half full. That's not a particularly thorny problem, since I know about it, and since we have a way to actually eyeball the tanks.
The holding tank sensor sometimes get's stuck -- like when the tank is dead empty after a pump out, and it sits empty for several days -- although a good THWACK! on the tank with a rubber mallet usually breaks it loose. Not so easy to get to, in our case...
It helps to actually eyeball a full tank -- at the tank -- and compare that with what the gauge says, so you know how to interpret the reading. Our holding tank is full when the gauge needle hits the top of the middle white area, i.e., BEFORE the gauge needle enters the red zone.
These are the new (i.e., installed on my watch) stainless in-tank sensors. The original plastic sensors were crapped out (so to speak) when we got the boat.