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The built up pressure in the system from being clamped down.
The built up pressure in the system.
Yes you’re right I’ll adjust that above.
I’m actually not sure… this gauge had a ball bearing on the bottom to prevent air getting in until pressure is applied. But it was a cheapie from China so it is possible there could be a tiny amount of air in the gauge (there shouldn’t be). Don’t know how you’d remedy it though… I’m very trusting haha.
Simple DIY Force Gauge