where do you pulg in a aftermarket boost gauge
 

same as subject on our cars if you get a after market gauge where do oyu plug it in a do you tap a line or is it somthing else

put a T in the line that goes from the upper intake manifold to the factory boost guage.

-Chris

As chris stated, just install a T connector. I placed mine about 5 inches away from the Boost Sensor (little black box) located on the passenger side strut tower.