Do you ever wonder what your exact air/fuel ratio is? Well, now you can know with one of these Innovate analog air/fuel ratio gauges. They feature a new, sleek design to match today's modern styles. Innovate analog air/fuel ratio gauge are available in G2, G3, G4, and G5 gauge styles. Innovate air/fuel ratio gauges are not stand alone gauges, they must be used in conjunction with either an Innovate LM-1 meter or an LC-1 sensor controller.