Graph Tech Ghost - Manual (Page 25)

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If installing the Acousti-Phonic, the board and 9v battery can be
located beneath the magnetic bridge pickup. On some hollow
bodies you may need to rout this cavity deeper to make room.
If installing the Hexpander, the board can be inserted through
the hole you make in the edge of the guitar for the 13-pin jack.
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Some modification of the guitar body may be required to
install the ghost® system in your instrument. The modification
required depends on the design of your instrument,
and the ghost® components you’ve chosen to install.