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The leakdown tester has an inlet fitting, an outlet hose going to a fitting or adapter into the sparkplug hole. One or two gauges are mounted on the device. One gauge on the 'more deluxe' models monitors the regulated input pressure. There is a calibrated orfice across which the second gauge (or only gauge on 'simplified' models) registers the differential pressure. If there is no leakage, and therefore no airflow, the gauge reads 100 psi, for 0% leakage. For a reading of 95 psi, leakage is 5% ... etc., etc.
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Warren Hall
1973 911S Targa
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