Gaggia Espresso Temperature Pressure Modifications

This is a test of a modified Gaggia Espresso espresso machine. 1/4" copper tubing is routed around the boiler to preheat the water, and a pressure gauge is added. The over pressure valve OPV was then adjusted for slightly higher than 9 bar (130 PSI)and the gauge reads 140-150 PSI. Still haven't cut the hole for the gauge yet.
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From Home-Barista.com's "Buyer's Guide to the Gaggia Achille".
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