Sierra OP22900 Marine Oil Pressure Switch, 6 PSI Trip, Normally Closed, 1/8 inch - 27 NPT Thread

The Sierra OP22900 is a marine oil pressure switch designed to trigger a warning circuit when engine oil pressure drops to a critical level. It is built with a 6 PSI trip point and a normally closed contact design, making it suitable for wiring into oil pressure warning lights, buzzers, or gauge systems on a marine engine. The switch threads directly into the engine block or oil gallery using a 1/8 inch - 27 NPT fitting and connects to the boat's wiring harness through a 10-32 stud terminal, allowing for a straightforward electrical connection without special connectors.

Constructed from stainless steel, the OP22900 is built to hold up in the marine environment where corrosion resistance matters for long-term reliability. It is compatible with marine engine control systems and gauges, and works as part of a broader engine monitoring or audible warning setup. The switch is compact and lightweight at 0.31 pounds, and is finished in white.

This switch is sold as a single unit and is intended as a direct-fit replacement or new installation part for boats using a 6 PSI trip oil pressure warning switch with a 1/8 inch - 27 NPT thread and 10-32 stud terminal.

Specifications

• Brand: Sierra
• Manufacturer Part Number: OP22900
• Product Type: Oil Pressure Switch
• Trip Pressure: 6 PSI
• Contact Type: Normally Closed
• Thread Size: 1/8 inch - 27 NPT
• Terminal Type: 10-32 stud
• Material: Stainless Steel
• Color: White
• UPC: 808282368357
• Weight: 0.31 pounds

Frequently Asked Questions

What pressure does the Sierra OP22900 oil pressure switch trip at? The Sierra OP22900 trips at 6 PSI, making it suited for engines that use a lower oil pressure threshold for their warning circuit.

Is the OP22900 a normally open or normally closed switch? It is a normally closed switch, which is the contact configuration used for the 6 PSI trip point on the Sierra OP22900.

What thread size does the OP22900 oil pressure switch use? It uses a 1/8 inch - 27 NPT thread, allowing the Sierra OP22900 to install directly into a threaded oil pressure port on the engine.

What type of electrical terminal does this switch have? A 10-32 stud terminal is used on the Sierra OP22900, providing a simple connection point for the warning circuit wiring.

What material is the Sierra OP22900 oil pressure switch made from? Stainless steel is used for the OP22900, chosen for its resistance to corrosion in the marine environment.

How much does the OP22900 oil pressure switch weigh? 0.31 pounds is the weight of the Sierra OP22900 oil pressure switch.

What is the difference between the Sierra OP22900 and the OP22891 switch? The OP22900 trips at 6 PSI while the OP22891 is a 15 PSI trip switch; both are normally closed and share the same 1/8 inch - 27 NPT thread, but they are separate part numbers for different trip pressure requirements.

What is included when I order the OP22900? The Sierra OP22900 ships as a single oil pressure switch unit.

Is the OP22900 switch compatible with marine engine warning systems and gauges? Yes, the OP22900 is compatible with marine engine control systems and gauges, allowing it to be wired into an oil pressure warning light, buzzer, or gauge circuit.

What color is the Sierra OP22900 oil pressure switch? White is the color of the OP22900 switch housing.

Can the OP22900 be used with an audible warning buzzer? Yes, the normally closed contact design of the OP22900 allows it to be wired into an audible warning buzzer circuit as part of an engine monitoring setup.

Does the OP22900 require any special connector for wiring? No special connector is needed; the OP22900 uses a standard 10-32 stud terminal for direct wire connection.