I'm thinking about having an Air/Fuel Ratio gauge for my 12A FB in a pillar pod. I've read up, and I see that I need to have an O2 sensor mounted on my RB header. Can someone verify that the attached pic shows the location of the O2 sensor bung-mounting position? I assume it is, but would like to verify prior to having one fabbed into my RB 12A header. Also, does anyone know the thread pitch by chance; assuming it has a standard for O2 sensors.

 

That's the O2 bung and they all have the same thread pitch.

 

wait... so a 12a header comes with an o2 bung? or is that a picture from a 13b you just used to show where it needs to be?

 

That's a picture of the13B header from the Mazdatrix website. My issue will be how do I deal with the two separate long-primary presilencers if I were to do an A/F mix gauge. From what I've researched, I'd probably need TWO o2 sensors and use a switch to monitor each of the two presilencers. In summary, my system doesn't collect just after the header such as shown in that picture.