Oil Pressure Signal Light Switch

The oil pressure signal light switch is an electrically operated diaphragm-type switch. The diaphragm is spring-loaded and held against its contact point by spring tension when oil is not circulating through the system, closing the circuit (indicator light "on"). When engine is started, and as engine speed is in-

creased, oil pressure is raised a sufficient amount to counteract the diaphragm spring and open the circuit (indicator light "off"). Oil signal light switch cannot be repaired. Defective switches must be replaced.

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