I looked at the wiring harness of the original unit. There are two harnesses, 1 that supplies the power, ground, speakers, etc. 2 a second harness that isn't used when using an aftermarket head unit. I couldn't find a purple wire, but did find a pinkish, reddish wire. Do you think the speed sensor wire is on the second harness?
EX Polished Metal Metallic
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