Hi - and Welcome to Winnebago :-)
We have an '04 Vectra 40KD that behaves the same way. The transmission temp won't budget until the temp really rises (i.e. gets HOT).
Fortunately, our rig has the TripTek system, which lets us check the temperature through a set of digital screens that show on the backup monitor.
I console myself with the fact that the gauge *does* work when it gets really hot, so if the transmission ever does overheat, I'll know. When driving in high temps/mountains, I can leave the TripTek monitor on for the transmission temp and keep an eye on it that way.
I can also add that the transmission temp runs uncannily low, and I understand that this too is not uncommon for the rig with the side radiator setup, etc. I'm so used to watching the tranny temp like a hawk on previous rigs, it did take some adjustment on my part to be comfortable on the road.
Just my .02....others may (I hope) chime in!
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John S
2008 Journey 39Z Cummins 350 ISB 6.7L
2006 Honda CR-V LX Tow
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