Mercury - Helm Harness Triple Engine (Lower) Next Gen DTS Helm Harness 84-8M0157217. OverviewThis harness handles the lower helm on a triple-engine, dual-station DTS setup. It gives the lower station its own clean route into the system so the wiring isn't crammed together with the upper helm's path. Once the upper harness and helm-to-helm extensions are in place, both stations stay in sync without the controls feeling jumpy or uneven. It's a simple piece, but it keeps a busy layout from turning