For me I like to watch for detonation, That way if it starts I can let out of it before it goes boom and plus it gives you so much more info on how it's running.

 

Having the car for over a year now, the gauges in the vents just looks odd. Perhaps if I was new to the car.

What happens to the air that is directed to those areas? I guess it's no different than closing the vents.

 

Haha thats my car lol. I was thinking of doing what XXL did but i did mine quite a bit before he started i just dont have the time to do that. Putting the gauges where i did took me like 30 min and its blocked off from the back too so the hot/cold air wont hurt the gauges