2000 GT Radio Wires!!

Ok, I apologize for this is probably the 1000th thread like this, but I'm lost.

I'm currently trying to install a aftermarket head unit and when I pull out the factory one, the wires are all kinds of strange.

The colors of them are:
Light Green/Grey
Black
Black/Pink
Light Blue/Red
Black/ Light Green
Orange/Blue
Blue

Now, I've been back and forth on the net and I cant find a diagram that tells me what these do!

If someone could tell me where they go to or point me to where I can find a diagram it would be greatly appreciated.

I haven't cut anything yet, but I have no money for an adapter. I'd just like a diagram to these wires and maybe some tips on how I should go about the install.

Also yeah, I wanna keep the stock amp, as well as add another 200 watt amp so I can put in a 400w 10in sub.