arduino ecu

so im trying to design an o2 sensor using a narrow band o2 sensor coupled with a high temperature thermocouple up to around 900 degrees Celsius for temp compensation and i was looking for recomendations on this

It seems like you have done some research already. Where are you up to? What specific problems are you having?

mostly finding narrow band o2 sensors with accurate data sheets with temperature dependence so i dont have to do data collection in another way like a test chamber or something, also my car which is carburetted rn so i have no idea as to the afr so testing on that is a waste of time, and also good high temperature sensors to do the compensation with it doesnt have to be very accurate like within 10 or so Celsius

Here, I have some spare full-stops you can use:
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Paragraphs and sentences really help other people to read what you wrote.