What in the heck is the slot just above my head light switch

sierra slot   Dan sierra slot

It's a card slot In trucks with 4WD that is where your selector knob would be

Got my New AT4 and learning all the bits and pieces and I find a slot GMC CANYON AT4 GMC SIERRA 1500 AT4 GMC SIERRA HD AT4 GMC YUKON AT4  Scalextric Pro Chassis Ready ; Scalextric BMW Mini Cooper F56 PCR Chassis Ref : C8548 ; Scalextric Ford Sierra RS500 PCR Chassis Ref : C8546 ; Scalextric Honda

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