Javier, open up the panel.cfg file, in notepad. (Located in FS9/Aircraft/ehm_b19/panel/panel.cfg).
Find the section called [Window Titles].
It should be like this:
[Window Titles]
Window00=Main
Window01=GPS
If you don't have a line saying GPS, then there will be no GPS on the panel. If there isn't, then BACKUP the file first, then add under [Window Titles] a line that says
WindowXX=GPS
Where XX is the next number in the sequence.
Then lower down, below the last [Window YY] and all the gauge lines underneath that, leave a line and then insert the following text:
[WindowXX]
size_mm=456,378
window_size=0.5
position=8
BACKGROUND_COLOR=0,0,0
VISIBLE=0
ident=GPS_PANEL
gauge00=fs9gps!gps_500, 0,0
and then leave another line. Once again, XX is the next number in the sequence. Save the file, load up FS and the aircraft and press Shift+the number after XX, and your GPS should pop up!
Good luck - if it doesn't work, please ask or revert back to the backup file.