I posted that the supposed 'blue' wire on M24 wasn't blue, and that there was not an actual speed sensor on the vehicle. The radio connector is much easier to get to, and I don't know I'd start splicing wires at the Unified Meter (Instrument Cluster).

I just compared the wiring diagrams for the vehicle, and there is some differences between the 'Premium Sound' and 'Base Sound' systems.

On the Premium unit, the #9 pin, which is a Sky Blue wire (connector M43, small white connector at the back of the radio), is the Vehicle Speed Signal wire from the Instrument Cluster (actually #6 wire on M24, and yes, the wire is still Sky Blue).

But on the Base unit, the wire is not shown. Someone will have to pull there base unit and see if the Sky Blue wire is their or not, as it's not there at all on the wiring diagrams for either the Base model or the Instrument Cluster.

Appears that the wire is specifically generated by the Unified Meter for the radio.

Splice away my friends.