I was trying to install a shift light in my 09 vibe, and it has to be connected to the ECU rpm indicator wire. Does anyone know which wire this is, and an easy spot I could connect to??
So I ended up talking to some other people, and found a way to do this in case any one is interested. At the data link connector on the drivers side, the gray wire (pin 9 in the 16 pin plug) is the tachometer, so you can run the shift signal wire off of that.