Ok so I've been looking at buying an Aeroforce gauge (maybe two) and I want to know like what do I have to consider when I purchase it?
Like is it actually plug n' play, what do I plug it in to, do I have cut anything(I want to put them in the driver side vents on the right) and just anything that I should keep in mind??

Here'* a good install tutorial if you haven't already seen it:
http://www.bonnevilleclub.com/forum/...ic.php?t=38725

I may have heard the new ones get their power from the diagnostic port (down by the driver'* footwell) and you don't even need to tap it elsewhere.
Even if you need to tap a power source, it'* super easy. If you can install a stereo this would be cake.

They install easy. Just plug it in and yoru set. The only thing you may pave a problem with is teh power. Mine worked, but only once. I had to get power from a different location. The OBD2 conection didn't work on my car. Didn't take to long.

Yes a very straightforward install. You tie the power supply into the HUD power (brown wire) and a ground. The main connection plugs into your computer port under the dash by your left leg.
Turns on automatically with the key in run position.
One of my favourite mods.

So is it long enough to reach the HUD wire if I put it into the right side vents?
And if I get two of them, do I have to do anything to sinc them?
And is there any sensors to install?

Yes, the wires are plenty long enough. Route them thru the big rubber grommet that is under the steering column.
If you get two of them, you have to let them know so they synch them at the factory. No sensors required, just plug and play. :P