all i have is a 2.0 manual. but according to it , the purple wire is switched power for the gauges, the gray is the tach pulse, the tan wire is the temp signal, the only brown i see is a brown white that is the signal for the trim indicator. i would verify these with a grown up, but this might get you started. i talked to a guy today who thinks he has a 25' wiring harness, he is going ot check, but he said he would need to get $120. sounds pricey to me. if you want , i can scan and send you a pic or two.
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