It seems getStaticPressure now returns kPa instead of atm. You could either change the units to kPa or divide https://github.com/MuMech/MechJeb2/blob/dev/MechJeb2/MechJebModuleInfoItems.cs#L74 by 101.325 and maintain the atm display. I'm not sure how this affects the other modules (like landing predictions for example).