I interest in diplaying on the same 7-seg display2 differents offsets depend of a switch.

There is a FS.Standard.Gauges.Kollsman hPa and a FS.Standard.Gauges.Kollsman mBar input, so you can try setting the two to the same display and set a switch that changes whether one is used or the other is used. Not played with it yet, but it's something to consider