Mercury - Upper Dual Helm Harness Single Engine Next Gen DTS Helm Harness 84-8M0159749. OverviewThis harness handles the upper-helm side of a single-engine, dual-helm Next Gen DTS setup. It gives the upper station a clean path into the system so the controls feel steady and responsive. Paired with the lower harness and the helm-to-helm extensions, it keeps the whole layout organized instead of turning into a knot of wiring. It's a simple piece, but it makes running two helms feel a lot more natu