I'm going to try and do something with an Arduino in the E-box over the holidays. All the necessary wires are there including access to the dash warning light and looks like won't be hard. Would anyone have access to the voltage to temp conversion numbers or logarithm ?

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)