I asked the service department at my Ford dealer the same question about my F-150 when I was in for an oil change. I wanted two wires for my tranny gauge:
1. ignition on power
2. instrument cluster dimmer power (for the bulb)
They asked about 7 different mechanics and one of them finally knew off the top of his head. Alas, that was 2008 and I have forgotten the wire and tracer colors the guy gave me. But the dealer should have some one who knows.
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2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios