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The actual signal sent to the cluster is generated at the ecu on the beams, and other direct fire toyotas. On older toyotas, the tach signal was created by the igniter.
I used the msd 8920 once before. It was on my first 20v when I was using an msd blaster. The signal would not work with my toyota tach.
It seems that the beams tach signal is the more standardized type.
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