Accurate adjustment of tire pressures with the 9288 system tester

In view of tire pressure gauges' display tolerances and the difficulty of measuring the temperature of the air in the tire accurately, cars with what appear to be correctly adjusted tire pressures are very often only just above the switching threshold of the diaphragm-pattern pressure sensing switches. When a slight centrifugal force acts on the diaphragm at high speed, an entirely justifiable tire pressure warning is displayed.

To avoid this problem, tire pressures in the workshop should always be adjusted as follows with the Porsche 9288 system tester, and not with a conventional tire pressure gauge:

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