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    Author Topic: Electronic ignition / Tach  (Read 1793 times)

    Offline BadJoey

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    Electronic ignition / Tach
    « on: July 28, 2015 - 07:29:48 PM »
    I changed from points to electronic ignition will that affect my tach readings ( rally dash ) . According to my friends timing light ,has tach built in , My rpm's on light is 750 , inside tach is 1200 .Any thoughts ? As always Thank You.
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    Offline tman

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    Re: Electronic ignition / Tach
    « Reply #1 on: July 28, 2015 - 08:20:38 PM »
    I would hook up a 3rd tach to confirm.  Also depends on the ignition system you got.  You did not mention what electronic system you installed.
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    Offline JoeGrapes

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    Re: Electronic ignition / Tach
    « Reply #2 on: July 28, 2015 - 09:14:08 PM »
    It shouldn't. With either ignition the tach is connected to the negative side of the coil. I agree this calls for a 3rd opinion. Either your tach or timing light is wrong.
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    Offline JoeGrapes

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    Re: Electronic ignition / Tach
    « Reply #3 on: July 28, 2015 - 09:19:20 PM »
    Oh sorry, I was assuming you were using a Mopar Electronic Ignition. If you are using an MSD ignition then you need a tach adaptor from MSD to get the factory tach to read right.
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    Offline BadJoey

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    Re: Electronic ignition / Tach
    « Reply #4 on: July 29, 2015 - 11:17:02 AM »
    Mopar electronic ignition . I'm thinking the car tach is off . Thanks guys
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    Offline HP_Cuda

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    Re: Electronic ignition / Tach
    « Reply #5 on: July 29, 2015 - 12:49:12 PM »

    You will find that some tach's don't work well with certain electronic ignitions and require an adaptor to make it more accurate. Check your manufacturer and they will probably have a tech note on it.

    My last tach was this way and I pitched it, it was an Autometer tach.
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    Offline Cardude

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    Re: Electronic ignition / Tach
    « Reply #6 on: August 31, 2015 - 04:33:03 PM »
    Most '60s tachs won't work with modern electronic ignition, mine wouldn't work after I got rid of my points distributor so I sent it to AutoInstruments for a tach conversion and now it works perfectly.
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