I just found this photo I had posted elsewhere:


If you look toward the lower left corner of that photo, you can see a wire that is light blue with a pink trace on it. That wire is also a switched +12v source. I have it powering my aftermarket gauges. It's normally tucked neatly away in a small bundle of wires with a piece of tape wrapped around them labeled "Customer Access Wiring" or something to that effect. There should be a red, white, and black solid colored wires along with the blue/pink one.
The wire I'm referring to is just to the left of the red circle in this photo.