• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail

O2 bung, best location.

With the hamilton fuel injection kit, where is the best location for an o2 bung. I am getting an exhaust r & r after new years. I have a weld in bung, just not sure where it needs to go. Also, any preference on mufflers, with the efi.

Bill USN-1

F.I. Moderator
I put mine in the header pipe. That straight section just below the manifold before it sweeps back.
The idea is to keep it close to the manifold.
But the location isn't critical.
You can go back about 18-20' and not real affect anything.
You don't want to put it back behind the y pipe or way back behind headers.
The farther back the cooler the gases get and the sensor needs the heat to operate correctly.
That's why they make 3 wire and 4 wire sensors with built in heaters.


Active member
I'm currently using a sg13 1 wire narrow band sensor. It's installed just past the collector on the 4 into 1 header. It works fine there although it needs 600f to keep working and it does cool down after idling for a while.
Thanks. I did not know those things needed to be that hot, and now I know why the extra wires are on one of my other trucks. I think I will put it on the drivers side. More room and no starter heat shield in the way.