. Sierra Part #61546P.• Light gray dial, black graduations/numerals, white pointer staff• Scratch-resistant curved glass lens with black, near-flush bezel• White perimeter and blue thru-dial lighting • Dial Range: 0-7000 RPM• Tachometers (Electric): O/B & 4-Stroke Gas Engines• Sender Code: O/B ALT./COIL• Note: Mariner 30 & 40 HP (2-cylinder) engines require a module (Mercury P/N 17461A2) Near-flush bezel Perimeter and thru-dial lighting | Driftwood 3" Tachometer in Blue