GM MAP pinouts?

[Will Reeve]

Hi all,
I have acquired a GM MAP sensor for some diy manifold pressure measurements,
it's a three pin device with the numbers 3372, S97101 on it. Most web pages
say the pinouts are 5v, Signal, 0v. There is an identifying polarisation lug
next to one of the end pins, does anyone know if this pin is 5v or 0v? Or
are there any measurements I can make to distinguish the 0v and 5v pins?

Will

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