Auto Meter 5978 ES 2-1/16" Digital Wideband Air/Fuel Ratio PRO Gauge Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation 0-4v data output feed for ECU, data acquisition unit, or Laptop tuning User programmable range for Rich/Stoic/Lean conditions Peak recall/memory 10:1 to 20:1 AFR range for gasoline applications