The outside air temp as far as I know is only used for the OBC. Every 986 has the OBC built in, but it has to be activated. If you turn it on, but don't install a switch or stalk to move through the "pages" it will always show the first "page" which is the outside air temp. It can be activated by a durametric, and some dealers will (rarely) do it for free.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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