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Gk milton keynes pneumatic air pressure switch 
GK Milton Keynes Pneumatic Air Pressure Switch !!
  * GK Milton Keynes Pneumatic Air Pressure Switch
  * This switch was taken from a traffic control counter where an air tube was attached and ran across the road. A car would run over the tube which would put a pulse of air pressure to this switch, moving a diaphragm in the switch, and that was translated into an electrical pulse.
  * There are 3 terminals on this switch: 5-15V + and -, and output.
  * Removed from a traffic counter that was scrapped. Untested but expected to work fine.
Possible remedies (depending on the circumstances) can be: