Mercury - SC1000 Speed Kit 80 MPH Speedometer & 7K Tachometer Dual Engine White Face 79-8M0185892. Overview. The Mercury SC1000 Dual-Engine Speed Kit (79-8M0185892) gives your dash a clean, factory look with accurate SmartCraft performance data for both engines. This kit includes an 80 MPH SC1000 speedometer and two 7000 RPM SC1000 tachometers, both featuring a white face, bold black numerals, and glass lenses for sharp, glare-free visibility. It's designed for dual-engine SmartCraft setups and