Platinum 4" Tachometer - 7000 RPM (Gas - Inboard, Outboard & I/O)Faria Beede&&';;s Platinum Series Instruments feature spun aluminum gauge dials with custom graphics and a polished stainless steel bezel providing a rugged, elegant look. All Platinum Series gauges feature Faria&';s revolutionary domed glass Fog-Resistant lens. These lenses shed condensation and resists scratching and other types of fouling common in the marine environment.Electronic tachometers work by counting pulses generated by the ignition system, alternator, tach signal generator or magnetic pickup sender. The tach is hooked up to +12VDC, Ground and one of the signal sources listed.By selecting the right tach and setting the switch on the back to the correct position you let the tachometer know how many pulses are sent per each engine revolution.4" - Hole size: 3.375" (85mm)Specifications: Domed Glass Anti-fog, Scratch Resistant Lens Stainless Steel Bezel Blue LED Illuminating around the Perimeter of the Dial Illuminated Backlit Fire-Orange Tip Pointer Factory P/N TC8511*Sold as an Individual*Gauge Cover not IncludedThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns. Specifications: Gauge Size: 4" Box Set: No Voltage - Input Range (Volts): 12/24 V Series: Platinum Gauge Type: Tachometer Box Dimensions: 5"H x 5"W x 6"L WT: 0.7 lbs UPC: 759266220096 Brochure (pdf)