As for the gauge. . . Move the yellow signal wire to the Trailing coil and see if there is no change to confirm that you don't have a defective coil. A failed Leading coil is one reason for a dead tach.
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1993 Yamaha GTS1000
1992 Celica Turbo AllTrac
1987 RX7 Sport
1979 Yamaha G1, KM24 powered
1975 Dolmar KMS4
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