From: BobEngelhardt@comcast.net   
      
   On 12/18/2017 12:42 PM, 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"?   
   >   
   > Thanks,   
   > Bob   
      
   Once again I have not told the whole story :-(   
      
   I was going to use this tach on my milling machine spindle, not my car.   
     I think it works by pulsing a circuit between 2 of its connector pins.   
     It also can be pulsed by " ... PNP or NPN proximity switch, HALL   
   sensor".  Does that help determine what the mean by "wet contactor"?   
      
   Bob   
      
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