You might need to get one of the adapters/converters that MSD makes. Some tach's will not work correctly with the multiple spark boxes as it sends out multiple sparks rather than just one single spark with each firing.
Hello, give me a call and I will send you the resistor to make it work. I am running the factory tach and a MSD ready to run system and had to install a resistor. My number is 307-733-5129 ask for Mike
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