speedometer vs tattler

speedometer

noun
  • An instrument located within the dashboard of a vehicle that measures and indicates the current speed of the vehicle. 

  • Such a device incorporating an odometer. 

tattler

noun
  • A device fitted to a vehicle to measure mileage etc. 

  • Either of two similar bird species in the shorebird genus Heteroscelus (Tringa in some taxonomies). 

  • One who tattles (notifies authorities of illicit behavior) or is inclined to do so; a tattletale. 

How often have the words speedometer and tattler occurred in a corpus of books? (source: Google Ngram Viewer )