Add or withdraw up to 50% of injector duty Very easy to use and install. Compact "Piggy-Back" Fuel Management Computer. - Unit incorporates both the SAFC and the VAFC. - NEW "Easy" (8-Point) & "Pro" (16 Point) Modes. - NEW Color FED Display & Interchangeable Button and Background Colors. - Inverting "anti-glare" screen allowing view from both angles.