There is a writeup, but there is also a easier way to do this, I have! Here is what you need, go to the JY or Recycle yard and grab you a
1- servo unit
2- steering column with buttons
That's it, and i have cruise, be sure though that you are hardwired for it under the hood in your main fuse box, if not you will have to add a few relays, I personally just snagged a engine harness with the same year as mine and swapped engine harness from a donor ranger with cruise, To me that's oem and a direct swap, very inexpensive.