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The black water drain valve should be kept open anytime you are pushing water through the flush fitting. If you are trying to fill the black water tank with the flush and the grey water tank gauge shows an increase, you may have reversed wires at gauge like I did. They either installed flush in wrong tank or wired gauges backwards. Wire are a lot easier to fix. I just re read your post and if it shows that your shower is flowing into the black tank on gauges, the wires have to be reversed. The grey tank is directly below the shower.
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