Hey guys on my 06 g35 coupe, I have the stock navigation with the Bose system. Also I’m installing a pioneer avic-D3 HU double din, I found a wire color white and green I try it but it was giving me the wrong reading because I was doing 30mph and it said I was doing like 8mph and I also had the gps antenna on, so I don’t know what I have done wrong... please help

 

Answered in the identical PM, but for others' reference.

You've got the right wire.

It's more likely your antenna isn't in a good spot it needs metal directly under it and no metal at all above it.