My bad. I made a boo boo. The change should look like this:

[Window03]
Background_color=0,0,0
size_mm=447,106
position=2
visible=0
ident=10005
gauge00=Captain_Sim.p721.P12!P12_001_ap, 20,0, 427,106
gauge01=Cessna!Nav_GPS_Annunciator, 0,0,20,20
gauge02=Cessna!Nav GPS Switch, 0,20,20,20

I left out that 20 in the change to gauge00. I have actually reduced the size of all my 2D Panels, which is why I made the error. If you want to reduce the size of the 2D panels, let me know and I'll show all the changes I made to them.

Mark