Scratch resistant curved glass lens, with stainless steel, near-flush bezels. White dial, black numerals, black pointer with fire-orange tip. White perimeter and red thru-dial lighting. Size: 3" Dial Range: 0-7000 RPM Sender Code: O/B ALT./COIL * Mariner 30 and 40 HP (2-cylinder) engines require a module (Mercury P/N 17461A2) when using this tachometer. Not tested for non-original-equipment (aftermarket) ignition systems. Not for diesels.