I have a problem with setting camera clipping planes to get correct close and far rendering at the same time.
For both a cockpit panel and the rest of the scene.
You have to use two cameras. One to draw the cockpit, which will draw over the other which will render everything else.
This is a basic in video games; every single video game is made that way, for things like cockpits, icon displays etc.
You can have different settings for each cameras clip planes. This will hopefully sort out your issue 
If you need a bit more info on how to set this up then take a look at my answer to this question :
You certainly have to use two cameras for this. It’s a basic of video game development.
Every single Unity project (other than trivial test projects) uses many cameras. Enjoy!