So plot thickens with LCM involved! Since I am already into the ebox wiring I am going to poke/prod/cut and bit more to try and get a better handle on how things work with the gauge/light. Even if the light is codeable I want to see it come on when the the DME thinks it sees the trigger temp.

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