The B1900D, C90 and B200 all seem to have pressurization problems above 20,000 feet. Why can't Carenado get this one component right on their birds? With warning lights flashing all over the place because of the incorrect pressure gauge, it makes wanting to fly these birds almost impossible!!!

You can work around this if you disregard the scale on the dial (it's wrong) and just set a higher altitude. So you would e.g. plan to fly at FL200 but would dial in, I don't know, 280 on the outer scale. If this still leads to warnings, increase some more but keep the cabin altitude itself under 10.000ft.

 

The one (first) warning you run into is the differential pressure being out of limits (due to the mislabelled dial), the other one then could be mentioned 10.000ft barrier.

 

Once could fix this with editing the scale graphics or the gauge code. And you are right on that one, Carenado should do this.. now.