From this t4r.org thread 3rd Gen Scangauge II Owners! - Toyota - 4Runner . org Forum
and previously from fjcruiserforums......
If you have a SGII with the Xgauge feature, here is a code that people are successfully reading auto trans temps......here is the quote:
I've read about two 02' runners and a 99' runner getting it to work. Anyone with a Taco or 4Runner that has the SGII w/xgauge ready to enter this code?
I've only heard about it working on Runners so far, would be nice to find out what all it works for........A couple people tried on their 05+ tacos and it did not work, someone said the OBDII protocols changed in the 04'/05' revamp.
Makes me want to buy a SGII
From here: ScanGaugeII - Upgrade
Here is info about upgrading an older SGII with the Xgauge add on.....
The XGauge Feature will only work on ScanGaugeII, not the original ScanGauge
Free Upgrade if your ScanGauge was purchased on or after July 20th, 2007
The cost to upgrade if yours was purchased before July 20th is $25 (USD) per ScanGauge
There will be a new manual included with every upgrade
and previously from fjcruiserforums......
If you have a SGII with the Xgauge feature, here is a code that people are successfully reading auto trans temps......here is the quote:
This was posted in a link above...
"""" cloudcap previously said:
FYI, I've had a ScanGauge II for a few months and recently puzzled out the XGauge codes for measuring automatic transmission fluid temperature. Here's the scoop:
TXD: 686AF101B4
RXF: 044105B40000
RXD: 2808
MTH: 00090005FFD8
I've verified that this works with my '02 4Runner and suspect that the codes would work with an FJCruiser as well (even though the FJ is a *much* less capable off-road vehicle....). Please let folks know if you try it and it works for you. I'm not a regular reader of this forum, but wanted to pass the info along as it seems to be of general interest.
Regards"""""
I've read about two 02' runners and a 99' runner getting it to work. Anyone with a Taco or 4Runner that has the SGII w/xgauge ready to enter this code?
I've only heard about it working on Runners so far, would be nice to find out what all it works for........A couple people tried on their 05+ tacos and it did not work, someone said the OBDII protocols changed in the 04'/05' revamp.
Makes me want to buy a SGII

From here: ScanGaugeII - Upgrade
Here is info about upgrading an older SGII with the Xgauge add on.....
The XGauge Feature will only work on ScanGaugeII, not the original ScanGauge
Free Upgrade if your ScanGauge was purchased on or after July 20th, 2007
The cost to upgrade if yours was purchased before July 20th is $25 (USD) per ScanGauge
There will be a new manual included with every upgrade