I replaced my Sony monitor in my 2004 Beaver Monterey with the monitor I purchased from Tim. Mine was a simple plug and play. The existing harness plugged directly into the new monitor. It’s been about a year or so, and I can’t remember all the details, but it was easy. On mine, I did have to enlarge the dash opening slightly for the new monitor to fit. A Dremel with a grinding wheel did the trick.