Shift + 7
Make sure a few things:
1. The file (Carrier_Landing_Gauge.CAB) is in your panel folder.
2. The panel designator line is in your panel.cfg (assuming default panel.cfg: On line 12, Window06=Trap Gauge is there.)
3. The panel info is there. For me, on lines 108 to 116:
[Window06]
size_mm=1024
window_pos=0.000, 0.000
window_size= 1.000, 1.000
background_color=0,0,0
visible=0
ident=10040
gauge00=Carrier_Landing_Gauge!Carrier_Landing_Gauge.xml, 0, 0, 1024, 1024
I've attached my Sludge FX panel.cfg in case you had trouble following.