Oil Pressure Sender – Fits Volvo Penta & MerCruiser 3.0L, 4.3L, 5.0L, 5.7L (Replaces 815425T, 8M0068784, 3857532)

Oil Pressure Sender – Fits Volvo Penta & MerCruiser 3.0L, 4.3L, 5.0L, 5.7L

This oil pressure sender provides a reliable replacement for specific Volvo Penta and MerCruiser gasoline sterndrive engines. It is designed to fit a wide range of 3.0L, 4.3L, 5.0L, and 5.7L models, sending accurate pressure data to your dashboard gauge.

This sender is a direct replacement for MerCruiser part numbers 815425T and 8M0068784, Volvo Penta part number 3857532, and Sierra part number 18-5899.

• Installation Type: Direct fit, screw-in
• Fuel Compatibility: Gasoline
• Connection: Single-wire (1-wire) electrical connector

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.

Technical Specifications

Package Contents

1 x Oil Pressure Sender/Sensor (Replaces 815425T, 8M0068784, 3857532)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning work.
2. Locate the Sender: Find the existing oil pressure sender on the engine block. It is often located near the oil filter or the distributor.
3. Disconnect Wire: Carefully detach the single electrical wire from the top of the old sender.
4. Remove Old Sender: Using an appropriately sized wrench, unscrew and remove the old sender from the engine block. Be prepared for minor oil spillage.
5. Prepare New Sender: Apply a suitable pipe thread sealant to the threads of the new sender to prevent leaks. Do not overtighten.
6. Install New Sender: Screw the new sender into the engine block and tighten it securely.
7. Reconnect Wire: Attach the electrical wire to the terminal on the new sender.
8. Final Check: Reconnect the battery. Start the engine and carefully check for any oil leaks around the new sender. Verify that the oil pressure gauge on your dashboard is providing a reading.

Troubleshooting & FAQ

Q: How do I confirm this will fit my engine?

A: The best way to ensure compatibility is to match your existing part number to the cross-reference list: MerCruiser 815425T/8M0068784, Volvo Penta 3857532, or Sierra 18-5899. Also, check the compatible engine models table. Visually comparing your old part to our product images is also recommended.

Q: What are common signs of a failing oil pressure sender?

A: Symptoms include an oil pressure gauge that reads zero, is pegged at maximum, or fluctuates erratically. An engine warning light may also illuminate. These signs indicate that the sender is no longer providing accurate data to the gauge.

Q: Where is this sender typically located?

A: On most compatible MerCruiser and Volvo Penta engines, the oil pressure sender is found screwed into the engine block, often near the oil filter housing or close to the distributor.

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.