Graph Tech Ghost - Manual (Page 71)

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Because ghost® saddles are non-conductive, on some guitars
this can isolate the strings from the grounded bridge and cause
them to pick up hum. This often needs to be addressed on
Les Pauls and other guitars with Tune-O-Matic style bridges,
including ResoMax® bridges. To ground the strings, run a
ground wire to the post of the tail piece, or other string anchor
point. On guitars where the strings are anchored in metal
ferrules pressed into the wood, each ferrule must be grounded
individually. This may take some creativity and skill to do invisibly.
String ground to prevent hum
Tune-O-Matic ground ResoMax® ground