That $9 pressure gauge almost wrecked my machine last week

Picked up a cheap gauge off Amazon to check my brew pressure, slapped it on the portafilter, and the numbers looked perfect at 9 bars. Then I heard a hissing sound behind me, turned around, and steam was pouring out of the boiler relief valve. Turns out the gauge was reading 2 bars low because the fitting had a leak, and my OPV was dumping nonstop for 4 days. Took a $12 thread tape kit and a multimeter to figure out the real pressure was 11.5. I'm glad I caught it before the heating element gave out, has anyone else had a cheap gauge lie to them this badly?

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