If you're good with your hands you'll figure it out. In the quote below (which I'm sure you've seen) I hid links in the text. The tools you need, the connectors, wires, everything. Get a few extra pins and experiment until you're satisfied with the quality of your crimps. After you've completed the new harness you'll need to cut your old one and put matching connectors on the existing harness wires. Before you do that, you'll want to strip off all the old tape/covering so you can trace back and identify the wires. You'll want to be sure to identify and mark before you cut because some of the wires are the same color. If you go back far enough you will likely find some of the injector wires branch from common harness wires. If that happens just leave the old splices and put the Weather Packs on about 2" or 3" after the common splices (just makes your job easier). Tim