none whatsoever. first i took out the cluster and soldered and wrapped the ammeter gauge wires together. then i followed the red and black wires inside the car to the bulkhead , cut the wires , and connected each of them to my new wires and ran them through the firewall to the starter relay. i wasnt worried about it looking factory, so i just re-routed them through an existing hole in the firewall. oriellys has the proper wire size and fusable links for like 5 bucks. make sure the two wires that come out of the bulkhead are elimated from any power source. it was really easy and did not take long. getting the cluster out was the most time consuming