Compression Gauge


Old 02-15-15, 07:46 AM
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Compression Gauge

I'd like to make my own compression gauge. I already have the adapter hose to fit my spark plug hole so I just need an appropriate gauge. Will any air pressure gauge work or does it need to be a special type? I would think that I would want a gauge that maintains the pressure reading so that the needle doesn't flucuate during the test or start to decrease after the test. I suppose I would need a check valve and connect it to a regular gauge. Having difficulty finding a check valve with 1/4" NPT and 1/4" quick connect.

Last edited by mossman; 02-15-15 at 09:51 AM.
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Old 02-15-15, 11:52 AM
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What's your aversion to buying one? I think I paid about $30 for mine at autozone [they probably loan them also] Mine holds the pressure reading until you either press the plunger or remove the gauge.
Old 02-15-15, 12:02 PM
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Harbor Freight (and other discount tool places) have them for about $20. You'll spend that much on all the other stuff you'd need for what you describe and it still won't work as well as a real one.

Right tool for the job and all that.
Old 02-15-15, 02:39 PM
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Sure, I could buy one I suppose. I was hoping to just have another gauge with check valve and throw it in the same box with my leakdown tester. Can't really beat $21.99 at HF though.
Old 02-15-15, 03:29 PM
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Trying to reinvent the wheel and going to cost more money but a simple tee a couple of close nipples then a valve stem (I know there's a better name)
Any place that sells compressor parts will have a 1/4" check valve.
Lowes and HD have them.

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