Mercury - Speedometer 80 MPH / KPH SmartCraft Analog Gauge White Face 85 mm 79-8M0052874. Overview. The Mercury SC1000 Speedometer (79-8M0052874) delivers accurate, real-time speed readings in both miles per hour (MPH) and kilometers per hour (KPH). The white face, crisp black numerals, and glass lens give it a bright, classic look that's easy to read in any light. Designed to fit a standard 85 mm (3-3/8 in.) dash opening, this gauge integrates with SmartCraft-capable systems for dependable, pre