So I did a bit more testing and found that even though I have 115 C coded the warning light still only comes on at 125! I also have warning to CAN bus active so maybe that is why. It might act as a toggle(or gate) so I will change that to inactive and try again tomorrow. BTW INPA puts an exclamation mark on the screen at 120 C and voltage across DME side of the sender is 0.40 volts at 126 C and light on.

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