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I have a shift light that I have been wanting to install on my C6 but I can't figure out what wire is the tach wire. Does anyone happen to know which wire this is or has anyone installed a shift light on their C6 yet?
The tach signal for the 2005 C6, is on pin #48 of the PCM. It is a white wire. The PCM is located on the passenger side of the car in the front wheel well.
This same wire runs to the instrument cluster to pin #5, connector 2.
It also goes to the Heads-Up-Display (H.U.D.) to pin #4.
Kewl. They didn't have that info when I did the install. The tuner that had the info didn't want to share it just like this time around but one of their customers did when I asked on the forum. One of the east coast tuners.