I just got a pillar pod from a Civic, trimmed it, and molded it to fit my A-Pillar. I also cut it so it would fit low in the pillar, well out of the way from where the airbag pops out so I don't have my psi printed on my forehead in case of deployment.

 

look at this site this is the pod that i have and i love it http://www.goapr.com/Audi/products/boost_gauge.html
i have also bought another pod that elimiates the a/c vent on the drivre side not a big fan of that one but it works

 

I already have a gauge I only need the pod