HOTSYSTEM Universal Electronic Air/Fuel Ratio Monitor Meter Gauge Blue Digital LED 2inches 52mm for Car Vehicle Automotive Accuracy of analog LED type:Every 0.5%,using BAR type to light up. Display range:Digital type is from 20.0% to 10.0%;Analog LED type is from 20.0% to 10.0%;Both of digital type and analog LED type will show the maximum or the minimum,if the value out off the display range. Warning(Red Light):At start, the voltage is lower than 11.0V,the value of AIR/FUEL is lower than 0.8 or higher than 10BAR(lower than 12 or higher than 120PSI). Direct analog:The digital has 20 LED pcs, 10.0%Air/Fuel ratio12.5%,the LED lights appear green among 6pcs; 13.0%ratio17.5%, the LED lights appear yellow among 10pcs;18.0%ratio19.5%, the LED lights appear red among 4pcs. Easy installation:Our gauge includes electric wire with necessary mounting and installation hardware,no need other sensor, your existing oxygen sensor can fit it well. Fitment: Fit most of gasoline vehicle. Fit 2&#034; or 52mm Diameter Gauge Pods holder Color: Smoked Tint lens when &#034;off&#034;,Color LED Display when &#034;on&#034; Scanning: (red-yellow-green-yellow-red) The gauge will both show the digital and analog LED. Electrics voltage display &amp; warning function.