1978 Z28 Tachometer reading way high

Discussion in 'Troubleshooting & Diagnosis' started by w10085, Aug 8, 2017.

  1. w10085

    w10085 New Member

    26
    0
    Oct 28, 2015
    North Carolina
  2. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

    8,813
    133
    Nov 4, 2004
    Ringgold, GA
    Here's who I used when mine went kaput, Daniel is also a site sponsor. I found it easier just to call him. http://www.gaugemarks.com/
     
  3. Ihada70Z28B4

    Ihada70Z28B4 Veteran Member

    130
    10
    Oct 4, 2002
    Buffalo,NY,USA
    Most likely your problem, but you can check the capacitor first. If you have access to a signal generator(optional) and can do a little soldering, then fix it and calibrate it yourself. It's very easy to do, I used the method in the second link you posted and the part is a few bucks. If you have an accurate tach to hook up separately you can just adjust the variable resistor you put in and match readings to calibrate. Signal generators make it easier though,and you can test the entire tach scale for accuracy.
     
  4. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

    25,265
    286
    Feb 26, 2004
    Bloomington, MN
    Make sure it's not a 6 cylinder tach.
    They will read high consistently across the scale. (4/3 actual RPM)
     

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