Auto Transmission oil change temperature reading software?

I know this subject has been beaten to death, but here goes;
2012 Tacoma Prerunner, 4.0 L with the A750E transmission.
Using both these links below, I've completed the procedure and am trying to do the final level routine at temperature check.
https://www.tacomaworld.com/threads/diy-full-flush-for-automatic-transmission.68462/
https://www.tacomaworld.com/threads/how-to-drain-refill-automatic-transmission.63851/
Everything through shifting the "N,D,N,D,N,D, AT TEMP light on for 2 seconds" works fine but when I go back to "Park", I get no light. I've tried it multiple times with no luck, so two questions;

I'm in south Texas where it's 95 to 100 degrees ambient. The local Tacoma tech tells me the proper temperature range for checking the level is from 97 to 115 degrees. Would it be reasonable to just run the engine for about 5 minutes, then do the level drain without getting the light?

2nd question. I understand on the 2012 that the transmission temperature isn't a standard OBD II function, but that I can get a Toyota upgrade on-line that will allow my ANCEL AD410 to read the temp. If so, where can I find this upgrade...my searches haven't worked.