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- #21
E
ecss
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MSD products have always had problems with GM tachs.
Install the OEM coil and see what happens.
Look at this link and the paragraph Tachometer. Read the last two lines. It describes the exact problem you're having with your tach.
http://static.summitracing.com/global/images/instructions/msd-6420.pdf
Did you install the MSD coil and MSD ignition box?
Install the OEM coil and see what happens.
Look at this link and the paragraph Tachometer. Read the last two lines. It describes the exact problem you're having with your tach.
http://static.summitracing.com/global/images/instructions/msd-6420.pdf
Did you install the MSD coil and MSD ignition box?