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Assuming that we are working here without known circuit diagrams etc.
+12V a bit obvious, main battery circuit once ignition is turned on, meter your other dash dials / wires to locate a 12V feed.
(-) is ground, again meter for ground connection wire or install a ground link yourself.
1 remains your lead back to the negative link on the coil which sends the tach signal to the tacometer.
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POKDUB
Porsche 911E
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