How to test vintage oil gauge
I just bought an oil gauge on eBay and would like to test it. Does anyone know a convenient way to test these, short of hooking it up to the engine? Seems to have a conventional threaded receiver in the back. I don't have much in the way of hydraulic gear lying around, so something that didn't require major tool investment would be ideal.
I thought about testing it with compressed air, but I thought it might break it.
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