I tapped into the wires to the clock for power, ground and light.
I ordered the vaccum line adapter with my guages I think it's P-47 or something like that. It's on the J-Spec site too. This allows you to tap the vacuum line on the hose coming off the BOV. This is the same place the factory gauge would tap and it's easy to get at.
Many people T off at the factory BOV vacumn line and needed the adapter.
YOU DO NOT NEED TO DO THIS!! The T-fitting that came with your gauge will fit if you T off at the FPR (as stated in the installation manual). I've mentioned this on NASIOC and only a few people have seen my post.