Innovate Motorsports 3830 Auto Timer for NA and Turbo Applications Widedand Air/Fuel Ratio Display Air/Fuel Ratio requires one of the following Innovate Motorsports wideband controllers: LC-1, LM-1, or LM-2 (*Not included in base Auto Timer kit, P/N: 3830) The Auto Timer Air/Fuel Ratio display range is 74 to 224, with a 0-5 volt linear input Using the Auto Timer to display your Wideband Air/Fuel Ratio requires one of the following Innovate Motorsports wideband controllers: LC-1, LM-1, or LM-2 (Not included in base Auto Timer kit, P/N: 3830) Accepts a linear 0-5 volt signal