Compare the panel.cfg in the panel.csweapon folder with the one in the panel folder. Weapon seems to copy then paste panel.cfg, then modify it.

For the original gauges to work, you should see entries like this:

[Window00]
file=..\panel\mini.bmp
size_mm=1024,768
window_size_ratio=1.000  
position=4
visible=1
ident=MAIN_PANEL

gauge00=..\panel\wwiif_spit!Airspeed,  55,617,137,137
gauge01=..\panel\wwiif_spit!Altimeter,  218,623,126,146
gauge02=..\panel\wwiif_spit!Attitude Indicator,  383,619,143,142
gauge03=..\panel\wwiif_spit!Turn Slip,  545,624,135,135
gauge04=..\panel\wwiif_spit!Vertical Speed,  697,618,142,142
gauge05=..\panel\wwiif_spit!Gyro Compass 2d,  855,617,144,145
gauge06=simicons1024!Radio Icon,  995,653,20,20

The original is like this:

[Window00]
file=mini.bmp
size_mm=1024,768
window_size_ratio=1.000  
position=4
visible=1
ident=MAIN_PANEL

gauge00=wwiif_spit!Airspeed,  55,617,137,137
gauge01=wwiif_spit!Altimeter,  218,623,126,146
gauge02=wwiif_spit!Attitude Indicator,  383,619,143,142
gauge03=wwiif_spit!Turn Slip,  545,624,135,135
gauge04=wwiif_spit!Vertical Speed,  697,618,142,142
gauge05=wwiif_spit!Gyro Compass 2d,  855,617,144,145
gauge06=simicons1024!Radio Icon,  995,653,20,20

You might also find that some of your Window Titles look like this:

[Window Titles]
Window00=Main Panel
Window01=Weapon Control Panel
Window02=HUD
Window03=HUD Glass
Window04=
Window05=
Window06=Engine
Window07=Radios
Window08=GPS
Window09=Clock

Sometimes it causes problems for my aircraft. You need to remove the WindowXX=blank, then renumber the ones that were in between so that all the Windows are consecutive. You will also need to rename the matching windows ([WindowXX]). If you are fluent at editing the panel.cfg, it's a fairly easy fix. If you aren't, then it will take a lot of effort to correct.

Hope this helps.

Mark