IME, you won't find a pinout for the connectors, so unfortunately you will need to trace each signal in the Bentley manual. I am VERY familiar with those connectors as I have done harnesses on eight spec Boxsters this year. Had you posted this a couple of months ago, I probably could have told what each signal was from the color off the top of my head. Now I would have to think about it... 
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'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
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