For what it's worth I've got a Communications Concepts Inc. (CCI) digital display for my FRG-7. It sits on top. No longer available of course but if you can find one I can highly recommend it. It's easy to program for the FRG-7 and it works very well. DXing with the FRG-7 and this display is a lot of "old school" fun.
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Cheers,
John