Hey. Yeah, having the same issue. Can't read the labels in VR during daylight. And I am running a Meganex8K with a 4090, so there are a lot of pixels rendered, but this still isn't enough. Luckily there aren't that many switches, so I just memorized them.
But I also have the problem with very bright sunlight making the gauges a bit dim. This seems to be a sim problem. Had that in other planes too. In MSFS 2020 you could mitigate that effect by turning on the gauge lighting, but in MSFS 2024 it doesn't work until it gets darker outside. Made a bug report about that ages ago, but didn't got enough votes to be looked at.