Should i get a turbo gauge for my 2000 2.7t a6? If so where, should i buy online, is it hard to install, if so, can i get it done at the audi dealership, how much will the gauge and installation cost, etc. etc. Also, what is the exact function of a turbo gauge (is it worth the money?) sorry for asking alot, but if you guys could all chip in a lil information, id appreciate it alot. Thanks in advance