I got all the bits to mod my new Gaggia classic to set the pressure correct. Connected it all up and tested and was spot on 9 bar. Mine seems to be correct out of the box.
I know it's off-topic but I saw you also talked about coffee machines. I would like to ask for your advice. I can't decide between a Rancilio Silvia and a Gaggia Classic. I found only one article which compares Rancilio Silvia vs Gaggia Classic. But it would be better to hear your reviews. Can you please help me? Which one should I buy and why? Thank you