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24 The speed sensor wiring is routed along the parking brake cable to the firewall and secured by tie wraps. We used an existing hole in the firewall to route the cable through, but depending upon your routing path, you might need to make a new hole or enlarge a factory hole for the harness to pass through. This was a factory-punched hole with a turned-in edge. Drilled holes should use a small rubber grommet for wire protection.