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Yes, you're correct about any volume before the check valve getting added to the combustion chamber volume. There are online calculators for figuring combustion chamber volume, compression ratio, and compression pressure. But it would be best to put the check valve at the tip of the fitting...

There are two valves. One is the check valve to capture the pressure at each compression stroke, and the other is the relief valve so you can zero the gauge and start over. The check valve is the one that needs to be right at the tip of the fitting that screws into the cylinder. If you want...

Be careful that no significant volume is in your test rig between the cylinder head and the one way valve to the gauge. I've seen compression gauges that come with adapters for different spark plug thread sizes, with the check valve separated from the head by an adapter, and they give...

Always post pictures, no need to ask. :-)

Your test is valid, but it might not find problems that show up at high temperature or higher voltages like it sees in use. You could say that your test showed that the transistor is probably good.