I'm thinking of buying a USB Oscope to log sensors on the stuff that HP doesn't scan. I'll make small pigtails to pull the voltage straight from the sensors then use excel to plot it. Has anyone else done this? I figure that way I can pipe the wideband in on any car easily and would be for fuel correction only.

My first hurdle is that I would need to plot the lambda error like the histogram in HP does. Anyone know how that would be accomplished via excel?