From: jasen@xnet.co.nz   
      
   On 2017-12-18, Bob Engelhardt  wrote:   
   > 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   
      
   it seems that they bsically mean anything that generates a pulse every   
   time the shaft rotates, what sort of sensor do you want to use?   
      
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