SM-AFR accurately measures the precise air/fuel ratio (AFR) of any internal combustion engine.The iMFD DM-200 is a 60mm (2 3/8") universal gauge designed specifically to display a wide variety of automotive information far superior to that of a standard automotive gauge. The DM-200 can display up to 4 different sensors simultaneously and can be connected in a daisy-chain with up to 32 sensor modules and 32 other display modules.