Wideband Air/Fuel Guages

[Lael Cleland]

I know the LM1 uses a bosch 16 121 sensor....then you just need a 0-2 volt display...

[Eagle7]

I've got a Tech Edge WB controller and display that I built from a kit. Normally also connected to my Megasquirt, and logged each session. Lets me tune AFR at the track without a dyno (as long as you already know what the AFR goal is). These days I think your best bang for the buck is probably the Innovate LC-1.