Well, you've got one more instrument cluster than me. From two, I assembled a set so that everything works except the amp meter. I've sent away the clock to get a quartz "heart" to Instrument Services 800 558 2674. The main difference between the wire harness for the rally pak was the six wires instead of the 5 that plugged into the back panel pins. I also had a bit of trouble finding the tach wiring diagram in the service manual. Good luck with yours.