This is only used on applications using a CD Box, such as an MSD 6AL, while not using timing control.
Note: Plugs into the connector labeled "IGNITION" on the main harness. The Loose yellow/black lead connects to the "Tach Out" terminal of the ignition box. Caution: Never connect this wire directly to the Ignition Coil.
WARNING: It is against the law to install this part on an Emissions Controlled Vehicle