The PE-5021-00 is used to connect the Summing Board to the Acousti-Phonic. This component is included with the PE-0240-00, PE-0340-00, PK-0680-00 and PK-0780-00.
This item is not used if you are installing the Hexpander
Ghost Installation Instructions Ghost Acousti-Phonic Frequently Asked Questions Ghost Pickup Frequently Asked Questions