240, I am also thinking that I want a wideband for the AF. I think a narrow band for Boost and IAT is adequate. Though I am leaning to an oil pressure instead of IAT now. But that means I will have to install another bung for the wideband O2 I think.
Or could I replace the factory narrow band O2 with a wideband that has two outputs, wide and narrow? I think I read somewhere about one like that to feed the ECU the right signal and still have the wideband for the gauge. Anybody have any info on a dual wide/narrow O2 sensor?

MikeR