i didnt hook up the green wire so i cant adjust the dimness with the stock setup but i can adjust the dimness and brightness with the guage settingsDon't do this. Those stock wires are for lighting (the bulb in the stock gauge), and the voltage varies as the dash brightness is adjusted. You will have problems doing this.
Use a proper +12V from the fuse panel, and a good ground from a metal piece under the dash. For the green (lights wire), connect that to the headlight/parklight switch or even directly to a park light (positive side).