Calorstat OS3537 Engine Oil Pressure Switch

Engine Oil Pressure Switch for Saab and Jaguar

Calorstat OS3537 is an engine oil pressure switch with a 1/8x27 NPTF thread size for direct-fit service on select Saab, Jaguar, and Volvo applications. It is specified for vehicles such as the Saab 900, Saab 9000, Jaguar XJ6, Jaguar XJS, Jaguar XJRS, Jaguar Vanden Plas, and Volvo 760.

• Engine oil pressure switch for pressure-signal monitoring
• 1/8x27 NPTF thread size
• OE-referenced fitment for select Saab, Jaguar, and Volvo models
• Cross-references Quality-Built 11526 for the same application
• Part number: OS3537

Detailed Product Information

Calorstat OS3537 is built for vehicles that rely on an oil pressure switch to report engine oil pressure status to the warning system or gauge circuit. The 1/8x27 NPTF thread specification is the key fitment detail, and the listed applications include 1998 Saab 9000, 1995-1997 Saab 9000, 1979-1980 Saab 900, 1993 Jaguar XJRS, 1984-1990 Jaguar XJS, 1984-1989 Jaguar XJ6, 1985-1987 Jaguar Vanden Plas, and 1984 Volvo 760. Use OS3537 when replacing a worn or inaccurate switch on these confirmed applications.

This part cross-references Quality-Built 11526 for the same application.

Common Reasons for Replacement

• Oil pressure warning light stays on or behaves inconsistently
• Oil pressure signal is intermittent at the dash or gauge circuit
• Original switch has damaged threads or leaks at the mounting point
• Faulty switch causes incorrect low-pressure indication
• Service replacement is needed on Saab 900, Saab 9000, or Jaguar XJS applications

Installation Notes and Tips

Confirm the engine uses a 1/8x27 NPTF threaded port before installation. Inspect the connector, sealing surface, and surrounding oil passages for contamination or damage before threading in the new switch. Verify the warning lamp or gauge operation after installation on the applicable Saab, Jaguar, or Volvo vehicle.

Quality Assurance

Calorstat OS3537 is cataloged as an OE-referenced replacement oil pressure switch for the listed applications and thread specification.