Mercury - SC1000 Speed Kit 80 MPH Speedometer & 7K Tachometer Single Engine Gray Face 79-8M0185895. Overview. The Mercury SC1000 Speed Kit (79-8M0185895) gives single-engine boats a clean, factory-style gauge setup with full SmartCraft integration. This kit includes an 80 MPH SC1000 speedometer and a 7000 RPM SC1000 tachometer, both featuring gray faces, white numerals, and glass lenses for a sharp, modern look. Designed for single-engine Mercury SmartCraft systems, it delivers smooth, accurate