More from the developer for you on this after some findings today...
I did some testing with this today. The pressurization system is working correctly to my knowledge. When you exceed the maximum cabin differential pressure, the pressurization controller does not simply limit the maximum differential, but will "bump" (as the manual calls it) the pressure relief valve open with hysteresis to reduce cabin pressure before descending once again. I slightly adjusted the altitude goal animation to give more precise numbers (I doubt the unit in the real aircraft is this precise, given my experience owning GA aircraft). Don't forget that the marking on the face of the instrument also makes the setting subject to parallax effects. I also found the pressure differential needle to read about 0.1 PSI high, which has now been corrected, but this would not affect the warning annunciators.
Cruising at 25,000 ft, I was able to maintain a cabin altitude of 12,500 ft with a pressure differential of 3.674 PSI, which matched on all the needles. At 25,000 ft, the maximum pressure differential of 3.9 PSI was achieved with a cabin altitude of 11,800 ft, which is slightly better performance than advertised. I had found similar results on a previous investigation for another customer. Keep in mind that the cabin pressurization scale depicts pressure altitude, not adjusted cruising altitude. This means that the altitudes advertised will only be exact on a perfectly standard temperature and pressure day.
If you would like the new settings for the pressure differential needle of a more accurate reading, please change the following values in the "CabinDifferentialPressureNeedle" Component of AnalogBaron.xml. This file is located at: [YourCommunityFolder]\bksq-aircraft-analogbaron\SimObjects\Airplanes\bksq-aircraft-analogbaron\model.base\
MAX_VALUE 7 --> 9
END_DEG 285 --> 360
Good luck, hope that works.
