If you can mount it in the cooler line right where it comes out of the trans that should be good, just put a "T" in there and put the sensor in the T. I was told that was the best place on my big truck with an Allison in it because it comes right out of the torque converter and goes to the cooler, you'll see the highest temps there.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k