I have a water temp gauge that I installed in my middle vents above the radio on a 99 Trans Am. It is starting to fog up. I very rarely use the upper vents but when I put my defrost on heat still comes out of them and I think that is the problem. What have you guys used to block those vents so nothing comes through them?

 

I have heard that you can stuff some foam behind the gauge to help prevent the air from reaching it.

 

What kind of foam?

 

Great stuff, buy it at wal-mart or any home depot/lowes. Works great!

 

Just a chunk of foam rubber... wedge it in the vent.

 

Yeah what he said.

 

That would prob be easier than great stuff. But great stuff is awesome!