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A quick update:
3 months and approximately 10,000 miles later, I'm still loving this gauge. My brother and I spent 6 weeks in June and July driving across Canada in the truck loaded down with all sorts of junk and a couple big DH bikes on a rack out back. It was very reassuring to be able to monitor transmission temperatures while climbing some of the mountain passes in BC and see that the fluid was indeed getting hot on some of the climbs, but not hot enough to warrant pulling over. Near the end of the trip the fluid in my modified blue fan clutch appeared to give up the ghost so we had minimal airflow through the radiator and transmission cooler at low speeds. Between the Scangauge and this gauge it was easy to tell when to pull over and let the truck idle and cool down so we wouldn't burn anything up or blow a headgasket. This gauge is still one of my favourite additions to my truck!
On a related note, I have not noticed any different behaviour from my engine or transmission while operating without the ATF temperature sender in place. I still agree with TrickyT that we can never know for sure whether the ECU relies on the OEM transmission temperature sender for anything other than turning on the ATF idiot light; however after a couple months and a lot of hard driving (20 hour periods of driving, only stopping for gas) I am comfortable with modifying the system as I have.
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Adam - 96 LC
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