Mercury - SC1000 Speed Kit 80 MPH Speedometer & 7K Tachometer Single Engine Black Face 79-8M0185894. Overview. The Mercury SC1000 Speed Kit (79-8M0185894) gives your single-engine boat a clean, reliable SmartCraft gauge package straight from the factory lineup. This kit includes an 80 MPH SC1000 speedometer and a 7000 RPM SC1000 tachometer, both with black faces, white numerals, and glass lenses for a sharp, easy-to-read finish. Built for single-engine SmartCraft setups, it provides smooth, accu