GNS 750 how?

Installed this mod on Just Flight P28 Arrow, but have no access to dial in to Nav2. What I have is
as the first image, What I need is as the second image. This combination is not available on the plane’s pad.


image 2

NAV 1 on top right of the left GTN750 GPS

NAV 2 on top right of the smaller GTN GPS on right

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