I have 2) Duetwifi's with 7" Panel Due connected. I notice that 1 of the displays seems visually noisy. Both are connected to identical PSU's. Any thoughts

Do you mean that the display is shimmering? If so, this is a problem that seems to affect some 7" panels. People who report it say it goes away if they touch the ribbon cable connector on the back of the panel.

The 4.3 and 5" panels have some sort of shielding over the ribbon cable, but the 7" panels don't. Maybe they need it. If I ever get a panel with this problem, that's what I will try.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Yes, Shimmering. What type of shielding would you try?

Perhaps aluminium foil with Kapton tape on both sides to stop it shorting against anything.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].