O.K. From what I can see on the wiring diagram, the wire should be green only, and it goes to two different spots. It should connect from the ignition module to the back of the tach, and also go to the ignition module. I'm not sure how much that helps, but I hope it does. Check that all connections are clean and hopefully you'll make some progress. As far as where it actually enters, I'm sorry, I can't help. The only actually wiring harnesses I have are 95, perhaps someone driving another 89 can help ya with that one.