We keep getting asked about installing an aftermarket boost gauge into the stock location. 
Here are some pics of one of our installations. 
This is using the 2 1/6" Autometer Z Series Boost gauge that we supply. ($65.00) 
This is a simple job that anyone can do. It is much cleaner than hanging a gauge off the A pillar.
I hope this clears up the questions.
Thanks,
Top-End Performance
 
 
    Hole cut in circuit board to route hose
 
 
   Cluster removed with new gauge in place
 
 
    View of rear of cluster completed with light wiring and tube fitting in place.
