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Wideband sensor adapter

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Hi guys, is it ok to use an adapter to fit the 18mm sensor into a 12mm exhaust bung? sensor wont be in the gas flow but will it still register ok?

I have used one of the innovate swivel ones in a jet ski that only had a 12mm hole in the water jacket, it seemed to work ok. I would only do it as the last resort but better than nothing.