Innovate Motorsports 3794 DB RED Wideband Gauge Only 0-5 volt Input Linear (2 1/16 52mm) GAUGE ONLY - Accessory for LM-1, LC-1, LMA-3, or DL-32 Gauge itself is analog only- not serial Accepts a linear 0-5 volt signal Air/Fuel Ratio Range is 74 to 224 Blackout appearance when unpowered