First of all, the car's DME control system needs to know a variety of information to keep the car running correctly, including outside air temperature; second, ALL 986's left the factory with OBC system installed, but it was only activated on those that paid for the option. Installing the fourth stalk on the steering column and activating the system was one of the most popular DIY mods way back when............
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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