I picked up a ScanGuage II yesterday, hooked it up today, and then programmed in the X-Gauge. Will start logging my ATF data and report back with my findings.
Ok I've used my new ScanGauge II for the past two days now. Have driven a total of 250 miles in mostly 40-50 mile intervals. Intake air temperature have been between 65 to 90 degrees F, and I noticed that my ATF temp is typically less than 2X of the intake air temp. So generally if air intake is 65 degrees, my ATF will be around 120. The highest that I've seen my ATF temp is 160.
Hopefully this means that all is well and that I must have just been in a really unusual situation when I overheated the ATF.