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You would need to add the instrument to the aircraft panel in Plane Maker. Here is the section of the manual that covers making an instrument panel. I believe you should be able to drag and drop an existing instrument.
I've uploaded what I see when I open the default Cessna 2D panel in Plane Maker. If you are seeing something different, please upload a log.txt from immediately after quitting Plane Maker and provide the exact steps you are taking to see it.
Hi, the panel seems to be empty when I open it
EDIT: I'm running x-plane 11 beta
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