i have looked at the harness from Classic as well. It might be on my short list for spending this year. As to how hard it is to change a harness? That depends on what you are prepared to do. Can you get the dash apart? Can you get to the grommets? Are you willing to drain the radiator if need be? I know you can cut the grommet and get it around the temp gauge line, but that might not work for every install. Can you get under the head liner(got a wire up there for the dome light). Can you get behind the seat, and under the gas tank? Yep a wire under there as well. The question is not a bad one. The process is not that hard. But, and this matters. Are you ready to get to all of the places wire lives? Take your time. Get stuff out of the way. Take notes. Follow the old harness as best as you can. Not a bad, or tough project. It will take time. Call Classic. Ask if the wire has identifiers on it. You can do this. Remove the battery. Did I tell you to remove the battery? The thing about any project, if you do just one(yours) it will take more time than if you do a dozen(for others). Little things can be a PITA. Clips, grommets, light holders, and stuff I have forgotten. Don't let that stuff bother you. It happens to all of us. A tip, learned the hard way(aren't they all?) Tie a bit of string to the wire to the dome light. When you pull it out, you will have something to pull the new one back with. Enjoy.
