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Discussion Starter · #1 ·
I was wondering if anyone could tell me if the Apex'i EGT probe mount is any different from the mounting of others. The problem is that the instructions aren't quite clear..it says to drill a 8.4-8.5mm hole and use a 1/8 PT tap.

My problems are obviously, what size of drill bit would make a 8.4-8.5mm hole? Damn metric. And I vaguely remember that "PT" and "NPT" are different sizes, right?

Lemme know, I just don't want to screw up my manifold...of course, I do have an extra one :)

~John Tran
aka Tranman
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