Mercury - Upper Dual Helm Harness Quad Engine Next Gen DTS Helm Harness 84-8M0157222. OverviewThis harness handles the upper helm on a quad-engine, dual-station DTS setup. It gives the top station its own clean route into the system so the wiring isn't fighting for space with the lower helm. Once it's paired with the lower harness and the right helm-to-helm extensions, both stations respond the same way and stay in sync. It's a simple harness, but it helps a large multi-engine layout feel more o