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MikeK · 01-18-2021, 03:46 PM

Use water. Head pressure from elevated water is 1psi per 2.31 feet.
If you connect a hose and fill it with water 'till it is 6' 11 3/16" above the gauge it has exactly three psi, middle of the range for your gauge.

01-18-2021, 03:46 PM	#3
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Re: How to test vintage oil gauge Use water. Head pressure from elevated water is 1psi per 2.31 feet. If you connect a hose and fill it with water 'till it is 6' 11 3/16" above the gauge it has exactly three psi, middle of the range for your gauge.