The file F7F_vc1textures_t.dds is the updated panel layout.
The file F7F_vc2textures_t.dds is the updated panel layout with the optional night fighter radar screen installed.
To apply either of these save your original, and then rename the one you want to use with the number replaced by the underscore.
The alternate method is to hex edit the texture reference in your F7F-3_Tigercat_Cockpit0.M3D file to match the number you want to use.
You will need the original aircraft files by Greg Logan.
For the night fighter version of the cockpit panel you might want these as well:
A nice matte black replacement skin by Lewis;
My SCR-720 Radar mod.