Mercury - Gauge Mounting Nut 52 mm 11-8M0204699. Overview. The Mercury 52 mm Gauge Nut (11-8M0204699) keeps your smaller SC100 or System Link gauges tight and secure. It's the same OEM nut Mercury uses from the factory - simple, reliable, and made to fit any 52 mm (2-1/8") gauge housing.. Each pack comes with two nuts, giving you everything you need for a clean, rattle-free install or replacement.. Key Features. Fits 52 mm (2-1/8") SmartCraft and System Link gauges. OEM Mercury part for a perfect fit and solid hold. Marine-grade plastic resists corrosion and vibration. Threads smoothly onto the gauge body for a snug fit. Sold in pairs - two nuts per pack. Compatibility. Works with Mercury 52 mm (2-1/8") SC100, System Link, and auxiliary gauges. Performance & Practical Benefits. These nuts hold your gauges tight even in rough water. They're the right size, the right thread, and the right material - made to keep your dash solid and your instruments steady. Whether you're swapping gauges