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[15] Three wires from the ECU feed into this connector. The yellow wire is a tach output used when an MSD ignition unit is installed, so the Atomic can control engine timing. It can otherwise be used as a 12V square-wave trigger to a tachometer. The orange wire is an A/C kick-up wire, which compensates for the added load on the engine from an A/C compressor. Neither of these wires were connected at this time. The white wire is the tach input wire for the EFI, supplying the rpm signal from the distributor or ignition box. View Related Article
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