When removing the factory ECM, it's common for the factory engine wiring harness connectors to become brittle and the plastic sliders to break. This is especially common on higher mileage trucks that have been subjected to harsh weather and road elements that can cause moisture and contamination around the ECM connectors. Whether you are removing your factory ECM for installation of our Pulsar V3 tuning device, or for an ECM unlock service for flash tuning, don't let broken connector slides create unwanted downtime and expensive repairs. This kit includes two small slides and two large slides to offer complete repair of both engine harness connectors at a fraction of the cost of a new engine wiring harness.