The Instrument Mode panel (INSTR) is quite simple as it only has two controls or switches. Here is where the different instruments modes can selected.
The top one selects the Navigation mode data (NAV).
ILS/TCN -navigation data from TACAN-ILS
TCN -navigation data from TACAN
NAV -navigation data from NAV 1/2
ILS/NAV -navigation data from NAV 1/2
The second knob just calibrates the Compass Rose.
The panel is located in the bottom left corner of the Centre console next to the HSI.
The model was created in Blender 2.79 for the Cycles engine, the textures and materials are PBR based. The model has been rigged with a simple Empty for easy animation.