Well im glad im not the only one attempting this swap. I acquired a under the dash harness from a 92 YJ 2.5L jeep. I installed last night. All the connectors for the steering column were the same and also the light switch and dimmer. The heater box motor and heater controls worked too. There are a few others that I have not idea where they go. I am watching a speedo and temp, fuel, clock, guages on ebay from a 92-95. I also acquired a harness from the same jeep that goes to the tail lights. The connectors for the tail lights are different. I also cant find the connector for the fuel pump. Is that part of this harness? Also I have all the underhood harness from the XJ. I was going to use the headlamp harness from the 89YJ too. I was able to separate the XJ harness at the firewall and plug the headlamp harness in from the 89YJ. But does the other connector from the XJ control more than just the lights? hard to tell because they are all taped together. I guess i can plug it all together and see what happens. I have the harness that goes back to the tranfercase from the XJ so I think im ok there.
89 YJ unlimited with 4.0L