Rice
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This thread is ancient so I'm just posting in case others come along in search of a solution. If you install the MSD 8920 as indicated by the OP and the tach only reads 200 rpm, here is what fixed it for me. At issue, reverse the wires to the tach. Connect B/W wire to red going to the 8920 and connect G/W to 12V switched. After this my tach was happy.