Kerbal Space Program

Thanks for reporting.

Even the UI atmospheric gauge works differently from pre-1.0 times.

Release 0.25:
4th tick - 12500 m, pressure 0.0842
10th tick - 32000 m, pressure 0.0016
16th tick - 52500 m, pressure "IN VACUUM"

Here it seems the gauge was scaled to track altitude and colors suggested corresponding pressure. 4th tick used to be where people did gravity turn, 10th tick used to be preferred altitude for spaceplanes to go horizontal and start reaching orbital speeds.

Release 1.0.5:
4th tick - 7500 m, pressure 28.617
10th tick - 19000 m, pressure 2.8291
16th tick - 50000 m, pressure 0.0143

Here the gauge and its colors don't quite say anything useful. Maybe the 50 km level might be considered good altitude for circularizing and pulling the apoapsis out of the atmosphere as in orbital speeds there is no considerable reentry heat anymore, but the preceding two boundaries don't seem to be useful for any purpose.

Things that might be nice to have indicated on the gauge would be parachute deployment pressure levels - 0.01 (min) and 0.75 (max)