Mercury - Trim Tab Interface Kit Digital K-Plane to SmartCraft Link 8M0100069. Overview. Digital K-Planes deliver precise trim control, but they need the right bridge to show their position on SmartCraft instrumentation. The Mercury 8M0100069 Trim Tab Interface Kit creates that link, sending accurate K-Plane trim data directly to SmartCraft gauges and displays. It turns the tabs' digital readings into clear, reliable information at the helm, making it easier to see and adjust tab position while