Quote Originally Posted by Bagheera View Post
The Autometer pyro includes a ceramic washer and steel hose clamp setup to allow the probe to be drilled into the dump pipe without the need for a bung. 1/4" (6mm) hole is all that was needed when I installed mine this way, and I can't detect any exhaust leakage around the probe.
Thats how I did mine too using the Autometer brand with the ceramic washer. It's designed to drill and place in with the ceramic to hold along with the hose clamp.

No leaks on mine either, easy 5 minute job!