From: jasen@xnet.co.nz   
      
   On 2017-12-18, Bob Engelhardt  wrote:   
   > An eBay listing for a electronic tachometer specifies that it's input   
   > can be a "wet contactor".  Is there a standard meaning for "wet contactor"?   
      
   dry contacts is terminology used to describe contact frovided as part   
   of a device that are ot connected to any internal circuit and singnal   
   by chngeing from insulator to conductor,   
      
   by extension wet contacts must be switching current   
      
   I'm guessing that this wet/dry terminology is borrowed from hydraulics   
      
   In an automobiles before crank position sensors became common the tachometer   
   output would be taken from the ignition coil (where the points or electronic   
   ignition connects). There'd be a programmabile divider to compensate for how   
   many cylinders the engine has.   
      
      
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