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The tach needs to divide by the number of cylinders per rev if it's electrical. You could, in theory, multiply the pulse train for a straight 6 to drive a v8 tach (that's a 280se 3.5 tach?) by 8/6 with a little circuitry. That or find one of the tachs that was installed in the 250E or 250CE in europe. A rare thing. -CTH
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