used2bedomestic

I have a volt gauge from my last car I kept and would like to install in the 92 Teg.
I noticed there are two wires already attached to the gauge and the instructions say that they are for a dash light circuit. One is black and the other is white. One is for ground I assume but I am not sure? Can anyone help me on this one?
There is also a place for an ignition wire but I think it is for an acc wire like a stereo?
If anybody has done this before, please help me out.

Thanks.

M@rshy

Normally black, or the darker one, is ground and the light(White, red, green) is power.