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It goes to the map sensor line actually. If you hook it to a vacuum line, it will read vacuum. You don't want that, you want boost. If you go to Diesel Manor's site, they have excellent instructions for putting in a 3 gauge pod, just read the part about the boost gauge map line splice and bam, you are there. It is by far the easiest of the three to install. Good luck.
Alternately if you are feeling like it, you can tap a fitting into the spyder and install it there, but it requires pulling the spyder off to keep from getting metal shavings in your motor. Mine's in the MAP hose- quick and easy install.
Auxillary Intake Heater. It is the the intake spider, and is a coil to warm the intake air when it is really cold outside.. Many people delete it because it may pose a restriction to smooth intake air.