Internal ATF Temp sensor & then some

[lee]

I've been toying with the idea of adding a Tranny temp gauge. Searched a few posts to decide where to put the sending unit (seems the fluid out to filter/cooler line is most likely), then started thinking about the internal sensor.....

Alldata reports the sensor (nominally) sends to the TCU the following:

at 20C (68F) 3.0 to 3.5V or 2.3K to 2.7K ohms

at 80C (175F) 1.0 to 1.3V or 280-360 ohms.

OK, my questions: Does anybody have any other data points so I could determine the curve a bit better, or at least what voltage/resistance lights up the dash indicator)?

My intention is to use some circuit (TBD) and an analog voltmeter to show at least some general indication of ATF temp (realize this is probably not linear). With switching could double as a voltmeter - wow, what will I think of next - to keep tabs on the charging system.

Anyway, searched archives for this data and didn't find any. So, anybody know anything more about the sensor in the valvebody of the tranny?