Locate negative (black/White), and Tel Mute (yellow/black) wires on harness, and strip a small section.
Install shifter panel and pull wires through to the radio end, as well as run the RCA cable.
Now solder and tape the two leads from the rocker switch... one to the Tel mute, and the other to the Ground. It won't matter which goes where, only that they're separate.
Test the switch, by connecting harness to radio. When flipping the switch you should get a voice-in message
