I just bought a f90bt and installed it this weekend. I have connected the vss wire to what I think is the right wire in my car. I have a 2003 Subaru WRX and I connected to a green/yellow wire on the far right wire harness behind the instrument gauge cluster. I have the wiring diagram for my instrument cluster and it shows this wire (pin 2) as being the vss wire so I'm pretty sure that it is right, however I would like to be able to check and make sure it is. I have been looking around at it looks like on the old D3 model that there was a place to check the connection however I can't seem to find a way to do this with the f90bt. Does anyone know if this is possible? before I found the wiring diagram for my car I had it connected to a different wire that was wrong but as far as I could tell it was working fine even though it wasn't the right wire.

 

Thanks for any help you guys can provide