I replaced the entire wiring harness in my '68 Convertible and am just finishing up. The tech support from Painless is quite good and they are very patient with us rookie installers. I have been working with Jeff and will probably invite him to my daughters wedding........I will warn you that you will need some understanding of automotive electronics if you decide to make changes to the system, things like a high amp alt. w/internal regulator, electronic ignition, etc. These changes remove some of the built in features of the model specific harness and require slight modifications to the harness. All that being said, I'm glad I changed mine out, all the wires are color coded and marked for easy diagnostics and the can be identified anywhere you are in the car.