to add where is a good place to drill in the header for the egt probe- autometer says 1-2 inches away from head (which only gets readings from the one cylinder) or 6 inches down from where manifold and pipe meet.(in my case it only gets readings from 2 cylinders)
i was under the impression that it would go after all the pipes came together but before the catalitic converter.

where should i drill to tap the egt probe in?

thanks
Kareem