David:
Since the unit had the fitting, I had to use it, right?
The probe and the gauge were under $50 together and now I can monitor the temp in the diff.
Got the triple pod pillar mount and installed it there.
Not exciting really. Under tow the #'s get up there, but flatten out, so all's well.
Mag Hytec said that their testing revealed that it was hotter at the top of the unit as vs down below in the fluid..... Thus the probe hole up top. I trust them, but that doesn't sound 100% with me..... But it's good enuf!