Mercury - Lower Helm Harness Single Engine Next Gen DTS Helm Harness 84-8M0159747. OverviewThis harness is the lower-helm side of a dual-helm, single-engine Next Gen DTS setup. It gives the lower station a clean communication path without crowding the rigging bay or forcing tight bends. You'll still need the upper harness and the helm-to-helm extensions, but this piece handles the lower end of the system. It keeps the wiring predictable and makes the setup feel a lot more organized.. Key Feature