Ryan Buck
Full Access Member
I have it all out already but I have read it's the grey wire or the green /white wire which has 2 of those!the vehicle speed wire you want to connect to is on the harness that connects to the back of the instrument cluster, exactly which one can vary depending on your year/make/model, I would say the safest best is to pull the dash cover off, unbolt the cluster and then go by a well known audio shop in your area and ask one of the install tech's which wire you should use, that way they can just point it out since it will all be accessible on the spot.