Aeroforce Scan Gauge Installation?

[2007GPGTSC]

So I just ordered my Aeroforce Intercepter from ZZP which I thought was "Plug n Play" I just want some input regarding the installation of the gauge. I plan on doing it via the vent method as I do not want to mount a new pod. I have read mixed feelings about it requiring a 12v PS by tapping into a 12v power source that is energized when the ignition is on. 1. what would/should I tap into without problem arising if its even needed. (keep in mind I am an amateur and have never installed gauges) 2. does it require this to be done? I thought our OBDII's had a power pin. 3. what is the benefit of doing so regardless if it requires or not? I have also read about it causing excess battery drain if not connected to a 12v ps ? all input is appreciated

THANKS!

A little background :

2007
Pontiac
Grand Prix GT S/C
100k

references :

the two installs I have read several times - one mentions the 12v tap and the other doesn't

http://home.comcast.net/~warren.family/AFG.html
http://www.gpona.com/forums/04-08-gr...ls-t24978.html

[ILoveAudi]

If you want to run a power wire, just run it to the fuse box and use an add a fuse with a switched source. Not hard. The newer gp's may not have needed a power wire to automatically come on though. I know the 97-03 needed a power wire because if you didn't run one you'd have to keep unplugging and plugging back in to the obd every time you turn the car on.

[Jomamma]

For my 12V constant source, I use my amp power line. I connected it after the in-line fuse.

For my switched source I used an add a fuse and put it in the sunroof fuse spot. I dont have a sunroof, but their are many options.

[Lishap]

For my Aeroforce i used one of the open fuse locations in the side fuse box with an add a fuse works perfect.