Okay Gentlemen, I have researched this and need more help. Im trying to wire together my AM/FM stereo,Multiplex and 8 Track together in my 1967 Camaro. I have looked in the 1967 Delco radio manual and have found the answers i think. A Function Switch #7301641 that lets the multiplex and 8 track plug into it. So does anyone know where I can find a Function Switch and does someone have a picture of it? I know its a stretch but im hopeful someone out there knows what this is. Thanks, Bruce.