In the FSX\SimObjects\Airplanes\CS_B757-200\panel folder.

1. Backup the panel.cfg before modifying it!
2. Open the panel.cfg with Notepad.
3. Search for Window37. When you find this: Window37=Yoke, replace it with this: Window37=GPS
4. Search for [Window01] (in the [ ]), and change gauge04 from this: gauge04=Captain_Sim.200!iYoke,    0, 128, 24, 32 to this: gauge04=SimIcons1024!GPS Icon,    0, 128, 24, 32
5. Search for Window37 again, and when you reach the [Window37] (in the [ ]), replace this:

[Window37]
Background_color=0,0,0
size_mm=528, 394
window_pos=0.098, 0.70
visible=1
zorder=5
ident=10143
nomenu=0
gauge00=Captain_Sim.b757!CP_Yoke,  0,0,528,394

with this:

[Window37]
Background_color=0,0,0
size_mm=456,378
Position=7
visible=0
ident=GPS_PANEL
gauge00=fs9gps!gps_500, 0, 0, 456, 378

Now SAVE IT. Next time you ar flying the 757-200, press SHIFT+2 and click on the GPS Icon to bring the fs9gps!gps_500.

If you get stuck, I'll make a copy of mine available to download.