Another work around you could try is to pull up/down with a resistor the air charge temp sensor in the intake to make it look like the air is a bit cooler than it really is. The DME looks at that for "tip in" fuel amount. That being said I finally got my temp gauge problem fixed by cleaning the connector in the E-box, I might be imagining it but my tip-in throttle response seems better too!

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