To show attitude, altitude, airspeed, turn, heading, vertical speed, fuel, etc., and also sighting and ammunition if weapon is equipped. Currently I have to use f3 to keep it from diving into the void in the end _ (:зゝ∠) _ Not so immersive lol

I hope one day we have simple dashboard on these aircrafts. It can be like something in The Sky Crawler game but in Minecraft-style.

Ref:

I think it would be interesting to have Altitude/Speed as an Upgrade. This way you could opt-in to use it at the cost of the slot, so personally I would use it more like "end only" (for Altitude) but I think the idea is good (because having the Speed provides no "benefits" but it's just cool, like the banners which I love :D!