ok then I have a cat which will need a port fitting to it for inspection and a sensor.
does any one know about positioning the sensor? yes it is a very wide open question and I have googeled and read things but I am looking for info from people who have done stuff like this and have got it wrong and then done it right.
things like angle to gas flow?
vertical or horizontal or something between?
I think it will be mounting it on the conical face on the input side of the cat at an angle between vertical (up) and Horizontal but not either.