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APSX D2 is smaller and more cost effective than other Digital Wideband Air Fuel Ratio Controller Gauges of leading brands in the market today. It comes with benefits such as: 1 - Less wiring - no D1 controller required 2 - Simple installation - no D1 controller required 3 - Six bright LED color options (Red, Green, Orange, Yellow, Blue, White) 4 - Configurable Four types of fuel (E85, Diesel, Gasoline, Methanol) and lambda display 5 - Sweeping LED "needle" indicator from rich (green) then normal (orange) to lean (red) 6 - Fail safe connector - it is not possible to make a wrong connection 7 - Two bezels (black or silver), two faceplates (black or white) and two lens (smoked gray or clear) options 8 - Multiple outputs for digital (to PC), analog (to data logger / EMS), narrowband for simulation and extra switch options 9 - No need a PC or tablet for programming upper/lower limits and other settings