The Precision system comes without any wiring components. After you mount the ECU, coils and PMU, you fill out a wiring order form, complete with all the lengths of the various sensor, ignition and communication cables. Once I submitted that form I was contacted by Precision and asked for the firmware revision information on my various components. Turned out I had old stock on the ECU and PMU and had to ship them back for updates. Today the componets returned along with the completed cables, custom made to my specifications. I was keen to confirm that I had made the correct measurements and that Precision had followed them. I was not disappointed, the workmanship was excellent and everything fit as planned. The attached photos are not finished installation, only a first fitup.