No, there have been two different FGS products over the years -- first BergWerks, which went out of production around 2004 or so, and later on FGSSwitch, which was done by another company overseas and also went out of production some years ago.
Completely different in concept and execution.
BergWerks FGS kit
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FGSswitch FGS kit
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The instructions for the BergWerks FGS are posted here as a PDF.
Perhaps someone here who has used an FGSSwitch has the instructions for that product and can post them.
Cheers,
Gerry