Oil Pressure Sender 100 PSI

The Oil Pressure Sender 100 PSI from Classic Instruments is a precision electric pressure sending unit designed for engine monitoring systems on street rods, classic vehicles, and high-performance builds. This 1/8 inch NPT male threaded sender converts mechanical oil pressure into an accurate electrical signal that feeds directly into compatible electric oil pressure gauges. Whether you're installing a modern gauge cluster into a vintage engine bay or upgrading from mechanical to electronic instrumentation, this sender delivers real-time pressure data essential for engine health monitoring and tuning diagnostics.

This sending unit operates across a 100 PSI full-scale range, making it ideal for stock and mildly boosted engines where oil pressure typically runs between idle (15–25 PSI) and cruise (40–60 PSI), with peaks during cold starts or high-RPM operation. The electrical output is calibrated to match Classic Instruments gauges, providing a linear signal that eliminates needle flutter and ensures stable, readable pressure readings on your dashboard. The compact 2.5 x 2.5 x 2.85 inch form factor and minimal weight of 0.27 lbs make installation straightforward in tight engine compartments, and the NPT male thread accepts standard adapters if block boss relocation or manifold mounting is required.

Mechanics and enthusiasts restoring classic cars, building restomod platforms, or transitioning to full electronic gauge systems benefit most from this reliable sender. Installation requires only an open oil pressure port on the engine block or manifold—no modifications to fuel lines, electrical harnesses, or brake systems. Pair this unit with a Classic Instruments electric gauge for seamless compatibility and accurate pressure monitoring that enhances both daily driving safety and track performance assessment.