Not quite sure what your looking for on Scan Gauge, but Torque's OBD2 PID editor uses the following equation for Trans Temp(221e1c)
(((signed(A)*256)+B)*(9/8)+320)/10
where signed treats the incoming values as 8 bit signed. Works on my 2017 chassis. Hope it helps.
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Peter,
2018 Thor Four Winds 31Y
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