Next to the daylight sensor on the dashtop was an empty spacer for some feature that this 2003 XLE Camry didn't include. This turned out to be a perfect place to mount the external microphone for the handsfree used for Bluetooth mobile phones in the Blaupunkt Hamburg MP57 head unit I installed.
I also tapped the VSS wire (purple with white stripe on the clock harness) to send the speed pulse information to the GALA wire. I used 3M quick connects for 18 to 16 gauge wire, part number 03874NA. (These were kinda hard to find; only Pep Boys had them in my area.)
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