Hello,
From page 29 in the user documentation.
Manual Installation (optional)
If you encounter a situation where the weather gauge cannot be installed into a certain aircraft/panel, you can manually install the gauge instead. To manually install the gauge:
1. Locate the panel.cfg file which is located in <FSX Install Folder>\SimObjects\Aircraft (or Rotorcraft)\<Aircraft Name>\panel
2. Edit the panel.cfg file
3. In the [Window Titles] section, insert an entry for XGauge. You need to choose a unique WindowXX entry where XX = the number of the window to be assigned. For example, Window04=XGauge. Ensure that the window number is not used for any other item (increment any item after XGauge by one).
4. Below the [Window Titles] section, add a new [WindowXX] section where XX = the window number you assigned in the previous step. In this section, place the following text:
size_mm=659,489
windowsize_ratio=0.4
position = 5
Visible = 0
ident = 14991
zorder = 100
gauge00=XGauge!WeatherMap,0,0,659,489
5. Save the panel.cfg file and reload your simulator to see the changes
Let me know if this helps.