Maybe the previous owner had it deactivated for some reason? If the 4th stalk is there and it's functional then activating the OBC should be all that's needed.
My car is a 97, but it always shows the outside temp, as does my sister's 99 that only has 3 stalks as well.
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-O/D
1997 Arctic Silver Boxster, 5-spd
IMSR + RMS
Robbins glass window top
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