Homemade exhaust analyzer
 

Anyone ever made one? Thinking about something like this for my carbed bike.

I would read threads around various parts of the internet through the years about where people have tried to build these with an O2 sensor and a multimeter. There were variations, but the common theme was that they were unreliable and difficult to properly calibrate.

Like this?https://www.rbracing-rsr.com/rsrgauge.htm

It would be easier to pick up an Innovate LC2 wideband as it has logging capabilities although it would be tough to correlate it to an exact rpm match but if you used it for full pull runs it would work. I've tuned a lot of cars and find a gauge to be useless when driving, your attention needs to be on the road, especially on a bike.

To each their own.

I should have added "I would find it easier", no disrespect intended. I find it easier to tune while watching a data log and tune around the data.