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Jim Brierley · 01-18-2021, 05:24 PM

Stand in front of a mirror, seal your lips around the fitting on the gauge, blow hard while watching the needle in the mirror. You should be able to blow enough to make the needle move, that's all you really need to know.

01-18-2021, 05:24 PM	#8
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,088	Re: How to test vintage oil gauge Stand in front of a mirror, seal your lips around the fitting on the gauge, blow hard while watching the needle in the mirror. You should be able to blow enough to make the needle move, that's all you really need to know.