what size bung do most wide band 02 a/f meters use? the 17 or 18? or other? May finally finish the exhaust on my car this weekend and don't know what bung to use.
The Edelbrock A/F meter that I incorporated on my test stand came with an O2 sensor with 18mm threads.I don't know about others.
per the online megaquirt manual "If your car did not come with an oxygen sensor, you can add one. The thread for all oxygen sensors [including wide-band] is: 18mm x1.5mm - i.e., a metric thread 18mm in diameter with a pitch of 1.5mm, the same as 18mm spark plugs. To fabricate a bung to mount your sensor, you can go to your local automotive parts store and look in the section with all the HELP products. Pick up a package of "18mm Spark Plug Anti-foulers". Cut off the externally threaded part, and weld the rest to your manifold or down pipe. This works wonderfully and you can do 2 cars for 4 bucks. You can also get them from a speed shop under Holley part number Holley's 534-49 or MSD part number 2335 for about $10. Or you can go to muffler shop and ask for an O2 bung. And they can weld them in for you too."
