We had a '05 Vectra 40FD. Traded in May. First, I would put about 30 to 40 gal of very hot water in the tank with a couple of cups of dishwashing power and go for a long ride on roads that will cause the solution to slosh around a bunch. Let it stand over night and do a drain and flush. See if the gauges clear. Repeat the process but use more hot water and dish power. Again, let it all stand for a day or two after the ride. Drain again, sani-flushing as you do.
If this doesn't work you may have to get a plumber to spray acid into the tank, aiming for the walls.
If you do get the gauges working, use about a cup of dishwasher power with enzymes after each dump. I think mixing it with hot water first may keep it from lumping. I am doing this. My gauges on this coach are working fine. I add backing soda to control odors.
Happy trails,
Rick
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Rick & Melissa Young, 2011 Itasca Meridian 40U, Frtliner XCL, Cummins ISL 380HP/DEF, Allison 3000 MH, 2014 Honda CR-V, SMI AF1, Blue Ox, EEZ TPMS, TruCenter steering control
Servants On Wheels Ever Ready. Best job we ever paid to do . (full time volunteers)
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