I have never seen or heard of a pyro tip going through a turbo in all my time on these different diesel sites nor in my time owning and operating turbo diesel engines.
I have seen
THREE. 1 on a TD-30 dozer, 1 on a D-8 Cat dozer and 1 on a 600 CFM, Worthington Compressor.
Neither here nor their, IMO.
Don't know why but the Pre, or Post Turbo location of a Pyro (Thermocouple) has ALLWAYS created a Congressional "Filibuster".. Like.. Thread.
Bottom Line is:
WHEREVER it's installed.. Pay Attention to what Temps the EGT gauge is showing, under real time conditions. Set yourself a personal High temp... and back out of the throttle, or shift gears, if you get to it.
Pre or Post ? Niether here nor there.