Vernon,
 
  Unfortunately, I do not have enough knowledge on the subject to speak - or write about it accurately.  I believe it was used as a way to test the turn signals, headlights (?), from the drivers seat.  There was also a piece that was mounted on the rear speaker shelf, that monitored the rear lights, that could be viewed through the rear view mirror.  It could also be used as a reminder that you left your turn signals on, etc.
 
Larry Z16,
 
  Yes, It would be nice to have !!!
 
 
Kent
'68 Malibu ZZ502/502 :)
ACES #5102

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