Has anyone figured out how to connect the Speed Pulse (Pink wire) for a Mazda MX-5 with the Bose audio for a 2009? I have done a ton of research on this but haven't conclusively come to a point where I believe it is not possible. I have seen post for 2006+ MX-5's that suggest that VSS is not wired into the Bose audio harness. I have seen posts that say it is based on a microphone that senses road noise. I am fairly certain my stock Bose radio did adjust volume based on speed but can't seem to determine what wire (if any) is providing the signal.

 

Any thoughts?