Easy easy mod. Probably one of the easiest to do. I did it in my old 97 stripper and it was super simple. Get a good steering wheel puller!!!
1. Pull the wheel at the JY and grab the clockspring(airbag must not be deployed.)
2. Remove the negative battery terminal and let the airbags deactivate. Remove the blanks and the airbag. It should be 2 philips head and two 10mm? sockets.
3. Pull your own wheel and put on the JY clockspring. The harness is the same with or without cruise.
4. Put your wheel back on in reverse order and put the switches in place of the blanks. Make sure you connect your wires!
5. After the steering wheel is put together, pop the hood and go to the passenger side.
6. Near the battery, you will find a harness that is not connected to anything. You will also see a vaccumm line with a "T" on it. Plug your servo into both and then mount it to the fender. There are holes predrilled for mounting it.
7. Run the cable to the throttle body. There is a hole already there that accepts the plastic clip for it. Make sure you route it correctly. Just look at a picture in your Owners manual.
8. After connecting your battery back up and double checking everything, crank up your car and test it out. The green "Cruise" light should light up when you press the On button. If it does, then go take it for a drive. The cruise only works 35+ mph. Test all the functions to insure proper operation. The brake pedal should deactivate it.
Note: If your light doesn't come on, it could be the switches. Each year(s) had a different switch IIRC and you may have to find a specific year to match your XJ. If the Cruise won't stay set, double check your vaccum connection. If you have any questions, PM me and I will help as good as I can.
Cdub