For the communications equipment on my Lockheed L-1011 project I have picked Gables Electronics radio heads. The heads are simply frequency selectors for the VHF frequency range of 118.00 MHz to 136.97 MHz. 
The head uses a two drum-style digit displays that are backlit and are each driven by the respective two-element selector switch. The big rotating knob on the bottom of the two element stack controls the digits to the right of the decimal point. The smaller one on top controls the digits to the left of the decimal point.
The TFR switch points to the active frequency and renders the other one the stand-by frequency. The active frequency selection is also indicated by a green illuminated dot.
Panel Location
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