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| Joined: | 08-02-2018 |
| Location: | Long Beach, California USA |
| Posts: | 452 |
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I installed an MSD with the Pertronix ignition several years ago and had the same problem you have, the tach wouldn't work. I found the remedy in the MSD install instruction booklet. It recommended purchasing a Chrysler dual ballast resistor that was used from '73 to '76. I installed it as per directions and it's been working ever since.
I did mine 20+ years ago and my instruction booklet is dated 6/97. You probably have a newer book which may not have this information included.
The install was a snap, MSD switched red to one side of the ballast resistor, MSD white from dizzy to the other.
To get the B/R I simply went to a Chrysler dealership and got one from the parts dept. Unfortunately that option is not open to you, you'll probably have to find it aftermarket. Also, I believe it was used on their vans.