Yes, I was thinking of just tracking the temp with inpa and taking some voltage points and going from there. The beauty with the arduino is that it makes possible all kinds of flexibility including linearization, turning on the light at what ever temp, even variable brightness to temp, flashing etc. adding audible warning, even engine shut down if parked and self diagnostic features!
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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