Oil Pressure Sensor – Fits MerCruiser V6 & V8 Engines (Replaces 815425T, 34623)

Oil Pressure Sensor – Fits MerCruiser V6 & V8 Engines (Replaces 815425T, 34623)

This oil pressure sensor monitors engine oil pressure for MerCruiser, Volvo Penta, and OMC inboard and stern drive engines. It is designed to provide reliable and accurate readings to your vessel's oil pressure gauge, ensuring you can monitor critical engine functions.

This component directly replaces MerCruiser/Mercury part numbers 34623, 815425, 815425T, 8M0068784, 90806, and 90806A1; Volvo Penta 172127; OMC 3853800 and 3857532; PCM 982650; and Chrysler 90512.

• Thread Size: 1/8" NPT (National Pipe Thread)
• Pressure Range: Calibrated for 80 PSI oil pressure systems
• Installation: Direct thread-in replacement for easy installation

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Confirm your engine model/year in the table below.

MerCruiser/Mercury Marine

Volvo Penta

OMC

Technical Specifications

Package Contents

• 1 x Oil Pressure Sensor (Part #34623)

Installation Guide

1. Ensure the engine is off and cool, and disconnect the battery terminals.
2. Locate the existing oil pressure sensor on the engine block.
3. Place a rag or tray underneath the sensor to catch any dripping oil.
4. Carefully disconnect the wire from the sensor's terminal stud.
5. Using an appropriate wrench, unscrew and remove the old sensor from the engine block.
6. Clean the threads in the engine block to ensure a good seal.
7. Apply a suitable thread sealant to the threads of the new sensor.
8. Screw the new sensor into the engine block and tighten it securely, but do not overtighten.
9. Reconnect the electrical wire to the new sensor's terminal.
10. Reconnect the battery terminals.
11. Start the engine and carefully check for any oil leaks around the sensor.
12. Verify that the oil pressure gauge on your dashboard provides a stable reading.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: First, check the compatible engine models listed in the tables above. The most important step is to verify that your engine's original part number matches one of the numbers in our cross-reference list, such as MerCruiser 815425T or Volvo Penta 172127.

Q: What type of gauge is compatible with this sensor?
A: This oil pressure sensor is specifically designed for use with an 80 PSI electric oil pressure gauge. Using it with a gauge rated for a different pressure (e.g., 100 PSI) or a mechanical gauge will lead to incorrect readings.

Q: My gauge reads zero or is behaving erratically after installing the new sensor. What could be wrong?
A: First, check that the wire is securely fastened to the 10-32 terminal stud. Second, ensure the sensor body has a clean, tight connection to the engine block, as it grounds through the threads. An improper ground will cause faulty readings. Finally, confirm your gauge is a compatible 80 PSI electric model and is functioning correctly.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.