Mercury - K-Plane Y Harness Dual Tab Sensor Splitter 84-895820T02. Overview. Dual K-Plane setups need a clean way to bring both tab sensors into a single interface point, and this harness does exactly that. The Mercury 84-895820T02 K-Plane Y Harness links the bullet-style tab sensors from a dual-tab arrangement to the four-pin tab interface connection. It keeps the wiring tidy, the readings consistent, and the rigging easier to manage when both tabs need to report cleanly to the system.. Key Fea