This is a limitation of what DLSS can do on prerendered textures like the glass avionics, from what we can tell. Blurriness depends on the relative resolutions and is much worse at 1440p or 1080p than at Quality on 4K output. Ghosting on motion on the screens happens at any resolution. There’s no workaround on users’ end except turning off DLSS.
Asobo have expressed that they may be able to use some sort of “masking” to exclude glass avionics displays from the upscaling, but no firm word on whether this is feasible or when it would happen.
See thread from beta: