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The reason i say its not accurate is becasue i can run the truck for like 20 min and still wont raise the needle....long trips ive took it would evently start to work....and for the test port i know is line pressure just whats the difference between a plug in there or sensor.. with doing that i was going to read case temp rather than fluid temp...figured if case gets hot things are frying....
Sounds normal, you're in Michigan and it's still pretty cold there. If you don't do a lot of stop-and-start driving it takes awhile for the trans to heat up. I have my sender in the test port and it works fine like that. I also have a scan gauge that reads trans temp from the PCM and it's pretty damn close, I'd say within 5-10*.
 
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