midnightsadie wrote:
yes,, NEVER rely on the gauges, there very few that are accurate. dump blk first ,then gray. and put extra water in the blk before you dump . you want to get all the poo out.flushing the gray last helps clean the sewer hose.
It's usually safe to rely on the gauges to not read lower than they should. That is, if they show a third of a tank, you are almost certainly not full. The opposite is not always true; junk on the sensors can make them read higher than they should.
My tank gauges seem pretty consistently operational, for what it's worth. Their overall accuracy is naturally limited by the very low precision. I find them to be handy, but your mileage may vary.