Mercury - Rig Center Adapter Harness 12-Pin EHPS Connection 84-8M0181295. OverviewThis harness gives the rig center a clean way to connect to the 12-pin EHPS system used on 450R and 500R hydraulic steering setups. It keeps the wiring path straightforward, which really helps when space gets tight around the rigging bay. Everything plugs in where it should, so you're not fighting loose ends or guessing which connector belongs where. It's a simple, steady piece that keeps the steering system talkin