Autometer is the standard when it comes to performance, accuracy & durability with the legendary Tachometers. The patented air core meter movement, wound in house to exacting standards, can move the needle from 0 - 8,000 rpm in 333 milliseconds. Built to withstand the harsh conditions of the Australian climate, you're ready to embrace the best with Autometer.SPECIFICATIONS-Traditional Incandescent Lighting Illuminates Around the Perimeter of the Dial-Compatible with 2-4 Pulse Ignition Signals (4-8 Cylinder Engines) with Points, Electronic & Most 12V High-Performance Racing Ignitions-12 & 16 Volt Compatible, Well-Suited with Nearly Every Street Car or Race Car Electrical System-Gauge Kit Includes Bulb & Socket Assembly, Red & Green Bulb Covers, Mounting Hardware & Detailed Instructions for Installation-Bulb & Socket: 3220-Light Covers: Red 3214 & Green 3215-Mounting Hardware: Bracket Included-Size: 3-3/8" (85.7mm)-Type: Air-Core-Range: 0-8,000 RPM-Lighting: Incandescent