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Tach shows 4,200 RPM Max?

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by Texas GT350, May 11, 2010.

  1. May 11, 2010 #1
    Texas GT350

    Texas GT350 Well-Known Member

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    The previous owner add a MSD ignition system and when I bought the car the tach did not work. I called MSD and was told that I need a tach adapter which I installed and the tach works but no matter how high the engine rev's once the tach hits 4,200 rpm it stops. Below 4,200 rpm it appears to be correct. The tach is an original 3 wire Shelby tach.

    Any ideas?
     
    Texas GT350, May 11, 2010
    Texas GT350, May 11, 2010
    #1
  2. May 13, 2010 #2
    67200F5A02206

    67200F5A02206 Well-Known Member

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    In all likelihood the tach has a problem and needs to be rebuilt. Tachman can do it.
     
    67200F5A02206, May 13, 2010
    67200F5A02206, May 13, 2010
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  3. May 14, 2010 #3
    Texas GT350

    Texas GT350 Well-Known Member

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    I was thinking the same thing, is Tachman located around Dallas Texas?
     
    Texas GT350, May 14, 2010
    Texas GT350, May 14, 2010
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