Designed on a 0.96″ OLED screen makes it very small, yet visible. it can be mounted almost anywhere. Fully sun-readable and wide viewing angle. The gauge is ready for your Wideband AFR controller to output a 0 to 5 volts signal into to read 10 to 20 AFR. It does not come with any sensors or Wideband oxygen sensor controller. – AFR range : 10 – 20