[Walt Fricke]

You can weld an oxygen sensor bung into an exhaust secondary. You can buy these separately, or you can buy a nut of the proper size and (with or without machining it some to make a proper bung out of it) weld it over the hole you have to make in either case.

But you can also get, along with the LM-1, what you need for an "up the tailpipe" temporary installation. For on the road testing you will end up taping some wires along the outside of the car to get to the brains of the system that you probably want in the cockpit out of harm's way, but not a big deal. On a chassis dyno, even less fuss.

My only turbo temp experience is with my (former) F350, but that sensor is not down at the end of the tailpipe. Since you are looking at mixture, not heat, poking the temporary one up the tailpipe should be a reasonable place for it I would think, and maybe the exhaust has cooled somewhat by then?

Walt Fricke
(who should have purchased a bung rather than running around to friends with lathes to make one from a nut to allow installation of an O2 sensor in his SSI)