67 MGB Tachometer

[Kendall Robinson <kendallr@smtplink1.chey.com>]

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          Is it possible to have that loop of white wire on the back of the 
          tach (the one that goes from the ignition switch to the coil) 
          backwards?  The tach in my positive ground B isn't functioning 
          and I'm trying to figure out why.  I replaced the wiring harness 
          recently, that's what makes me think this could be the problem.  
          
          As usual, any and all help is greatly appreciated.
          
          Kendall
          kendallr@chey.com