DESC: Features: waterproof and scratch-resistant domed glass lenses, magnetic shielding, silicone dampening, powerful vector movement, American and Metric scales. Sahara gauges have bold black graphics on a tan dial. The graphics back light shines red in the dark, and the pointer is enhanced with a hot red-orange color. Also features night displays due to a combination of through-dial and perimeter lighting. Requires 3-3/8" hole for installation. 3'' diameter.