After reading Brad's observations, and they are good ones, I looked a little further on sensors. It appears that the user forum at ScanGauge, Toyota 4Runner or whoever has a posting of getting their device to work with '02 4Runners and obtain the tranny temps. I cannot say for sure this applies to the 3rd Generation 4Runner, like we have, but everyone says it will. Supposidly ScanGauge or a user has available the codes to determine transmission temperatures, I just am not finding a 3rd Generation user stating that as fact.
Here is a link to the discussion:
I do not have a ScanGaugeII, nor do I work for or have an interest in them. From what I read you have the ability to enter non standard codes, the gauge comes with the published codes, others have been found by users. You need some skill at entering these new codes so keep that in mind. Some people avoid DVD recorders, smart phones and anything with the letters GPS in them. If you fall into that category this is probably not for you.