i have installed 2 EZ wiring kits, both in my father-in-laws vehicles. one in a '51 Chevy Pickup, and the latest in his '47 Ford coupe connected to run the 4.6L. Both are 21 circuit and after power windows, locks, trunk release, a/c, all the basics, i could use a few more for future updates. The are color coded for chevy, but also have directions for Ford and dodge. You can get a black wire kit, but either way the wires are clearly labeled for what they are for. EZ wire is less expensive!!