Enrique,
I can't dim the radio illumination, if that's what you meant (I believe it is), so I'll start at the rheostat.
I connected only 1 speaker, so I know I am good there. The radio is far from perfect, but because it's OEM, it's perfect for this app
On another post, I had alerted readers that I am an electrical moron. I can figure some things out, but I am all thumbs otherwise. I am smart enough to put wire "a" to wire "b", but testing things isn't my strength. It hampers me tremendously, which is why I am asking loads of questions.
A point to note - I had a single red/blue coming out of the back of the radio. I stripped the edge of the wire, and slid it around the top right fuse (where the red/blue wire from the main circuit terminated). When this was not attached, the gauges didn't light either, so I suspect I must have done something wrong prior.
Now, I disconnected no connectors. I only connected the newly installed OEM connectors to the appropriate unused connectors in the dash. I also know that I cut no wires that weren't explicitly radio-related. So either I have a short or I did something improper. Given the electrical moron label I wear, I think it's the latter.
I'll start at the rheostat and work backwards.