Looking for car speed signal wire

[McOpCo]

I have a 2006 Buick lacrosse. I'm installing a new head unit and am trying to figure out how I would find the car speed signal wire. Any help would be appreciated.

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[trumpet 5,000+ posts]

I have a 2006 Buick lacrosse. I'm installing a new head unit and am trying to figure out how I would find the car speed signal wire. Any help would be appreciated.

You can cap or tape off that wire. It's not essential to connect it.