Even quicker to pull out the heater controls (no screws at all), plug in the 3 pin connector and route it wherever.
Takes 30 seconds all up.

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2005 E53 4.4i
2003 E53 3.0d (Mrs)
95 E38 740iL (sold)
93 E32 735i (sold)
91 E32 735iL (sold)
93 E34 535i (sold)
89 E34 525i with M30B35 conversion (sold)