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Tach all over the place can be an indicator of a bad alternator Voltage Regulator.
Check your idling voltage and at 2000 rpm and 4000 rpm at the battery with a meter.
Make sure it remains almost constant around 13-14 volts and isn't spiking.
Could be what killed your CDI if it was spiking up to 16-18 volts.
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Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
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