Super easy to install.You can use the starter cable you have now.You'll need to move the starter cable from the right to the left side of the starter sylenoid,then,run a 12 gauge wire from the plug on the starter to the right side of the sylenoid,where the starter cable was originally.Finished.I made my own harness,but I found out that Ford has a 12 gauge wire ready to go for this job.It has the cap for the wire cover on the starter,the wire has the appropriate ends,and all you need to do is put it on.Sorry,I don't know the part number.I'm still getting used to the sound of it.Reminds me of a Mopar starter.It's a lot smaller,and WAY lighter.Easy upgrade and well worth it.I did mine 2 weeks ago on my car.Good luck.