Transmission fluid temperature doesn't appear as one of the built in gauges of the ScanGauge but it is available as an X-gauge and I'm using it, among quite a few others, in my Tahoe just fine. The information I can see in the Tahoe is amazing.

As with the M5 using ISO protocols, the CANSF protocol that the X5 uses seems difficult to crack but I know the information is present because BMWhat can read tons of information. If it's accessible to the ScanGauge or not, I don't know.

The ScanGauge can display four gauges at any one time. I really would like coolant temperature, battery voltage, boost and transmission fluid temperature. Coolant temperature and battery voltage are already there. Just need the other two.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim