Bear in mind that you can also customize your HUD messages.. There are certain HUD messages I have totally removed .. I can look out the window to see f my lights are on.. and look at my flapos lever to see where they are.. My radiator is now on a slider so I don't need that info on the HUD either.. Other info can be edited so that say .. instead of Power: 90% it could just read P: 90% ...
this is doable now if you have a modded install. It isn't quite what is being discussed here but it can unclutter the hud quite a bit. If you want to remove an entry altogether.. like say the Engine On message (prop spinning .. engine on duhh..

) just remover the text altogether on the right. This way you can customize it to however you want to. Save the file and back it up somewhere and you are good as gold.