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I assume I'm supposed to connect to this wire (for my window switch install) by the PCM, but where is this wire located? What connector is it located in? Is there a better place to connect to other than under the passengers foot area?
Is PCM wire #66 supposed to be the tach/rpm signal? There's an easier one to reach on the driver side IMHO... search for shift light install in C5 Tech and you should be able to find a post describing which wire to splice into.
'99 and newer PCM's the tach wire is on the lower connector pin #10-white wire, 97/98 PCM the tach wire is on the upper connector pin #35-white wire. The pcm can be accessed by taking off front right tire and then inner fender panel (5/6 screws). It's actually quite easy, as this is how I did it. Look carefull and you will see numbers after taking the plastic clip on cover off.