Just went to hook up an AUTOMETER MEMORY PRO COMP TACHOMETER 6821 0-10000 RPM. Usually there are 4 wires Green (MSD), Black (GRD), White (LIGHT) and Red (POWER). This tach has a Red, White, Black and then a 2wire wire looks light a lamp cord. 1 wire is black the other is black with white stripe. Any ideas?
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