Hey there, sorry about the late reply. You can build yourself a harness with the proper tools (I would stay away from any pigtails), but you would need to read on wiring harness building techniques and best practices first. Otherwise you can get a terminated unit, more or less ready to run, from linuxman51. As far as tuning, read the MS and Tunerstudio reference guides in detail (best to print them so you can highlight and add notes with questions).