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2) Circuit diagram of Gaggia Classic with the KIT-GGP connection.
Useful links.
PID Modification by Auber Instruments’ Customer
http://www.thedomesticbarista.com/content/view/17/
http://praveen.nadaraju.googlepages.com/gaggia_espresso_modified
Wiring and Parts Identification
http://www.partsguru.com/GaggiaClassicCoffee.html
Espresso Machine Instruction Manual
http://www.gaggiashop.com/gaginman.html