Mercury - SC1000 Speed Kit 80 MPH Speedometer & 7K Tachometer Single Engine White Face 79-8M0185891. Overview. The Mercury SC1000 Speed Kit (79-8M0185891) gives single-engine boats a clean, factory-style gauge setup with the reliability of SmartCraft integration. This kit includes an 80 MPH speedometer and a 7000 RPM tachometer, both featuring a white face, black numerals, and glass lenses for sharp visibility and classic Mercury styling. Designed for single-engine applications, it delivers real