Just want to say that I played around with one of these last night. Very impressive little piece of technology. Its a very cool device to have if you do your own tuning. Its great to be able to monitor and record one's A/F ratios for detailed analysis. Great price.
Question: can you install the sensor in the 3rd Cat O2 bung? Will this provide an adequate place to get readings from? Or does one have to tap into the downpipe?