A bit about everything: Gaggia Classic. Controlling temperature using PID.
Gaggia Classic Mod: no water tank, instead fixed supplies for fresh and waste water, PID and manometer
PID on Gaggia Classic Pro - Game changer to budget espresso brewing at home - YouTube
PID KIT for Gaggia Classic Pro & Classic & Home w/ pre-infusion [KIT-GGP] - $199.50 : Auber Instruments, Inc., Temperature control solutions for home and industry
Gaggia Classic Pro Espresso Machine in Industrial Grey - Tiger Maple - Whole Latte Love
Enclosure for Gaggia Classic Pro Mods - Etsy
GAGGIA CLASSIC PID + SETTE 270WI - NO BETTER ESPRESSO COMBO FOR UNDER $1K. My friend u/dskot and I put in extensive real world use & tests, and wanted to help keep
CoffeePID - a generic PID controller for coffee machines — 1024kilobyte
Gaggia Classic Pro Semi-Automatic Espresso Machine - Whole Latte Love
PID temperature control kit for Gaggia Classic Pro 2018+, Classic & Home 701098738225 | eBay
Gaggia Classic internal PID walkthrough - gonna give you guys the steps and info on how to make an already sexy little machine that much more attractive if you're looking to, or
Homebrew Espresso Maker Modding With Gaggiuino | Hackaday
SOLD] 2019 Gaggia Classic Pro PID - Buy/Sell
Added PID to my Gaggia Classic Pro for a fraction of what the kits sell for. Please read my comment! : r/espresso
PID Retrofit KIT for Gaggia Classic - European Model RI9403 [KIT-GGX-EU] - $149.50 : Auber Instruments, Inc., Temperature control solutions for home and industry
Gaggia Classic Pro + Shades of Coffee PID Controller Review & First Impressions - YouTube
Amazon.com: Gaggia RI9380/47 Classic Pro Espresso Machine,1.3liters, Cherry Red: Home & Kitchen