AVIATOR instruments deliver the information you need to monitor your vitals in a clean, easy to read package that is designed to be rugged and take the abuse you throw at your high-performance vehicle, whether itÂ?s race, off road or daily driver. LED backlit glow red at night for for minimal pupil dilation at night. Instruments feature hard-shock case and spin-on back clamp with vibration dampening o-ring, waterproof up to 35 PSI from the front,. The AVAITOR instrument line will not only add distinction to the dash but will also make sure your ride is operating properly in any conditions. Topped with black bezels and flat glass for easy viewing in open-cockpit vehicles. Great choice for a hot rod with a modern twist Jeeps, off road, pro-touring builds with an aviation theme or any vehicle that demands a military look while maintaining easy visibility at night Air-Fuel ratio GENII gauges from NVU feature an LED backlit full-sweep analog readout of your AFR. ARF readings from 10:1 to 18:1 with 14 straight up make monitoring your mixture at a glance a breeze. Gauge operates from any controller or PCM output. Input ranges are user selectable :0-5V, .5-4.5V.