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 (Replaces 815425T, 8M0068784, 3857532) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Oil Pressure Sender – Fits Volvo Penta & MerCruiser 3.0L, 4.3L,...
Product Details
This Oil Pressure Sender – Fits Volvo Penta & MerCruiser 3.0L, 4.3L, 5.0L, 5.7L is a replacement sensor compatible with a wide range of gasoline marine engines. It is designed to provide accurate oil pressure data to your vessel's dashboard gauge, ensuring your engine operates within safe parameters.
This component serves as a direct replacement for MerCruiser part numbers 815425T and 8M0068784, Volvo Penta 3857532, and Sierra 18-5899.
- Installs directly via a 1/8" NPT screw-in fitting.
- Features a standard 1-wire electrical connector for easy setup.
- Engineered for use in gasoline-fueled marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 815425T |
| MerCruiser | 8M0068784 |
| Volvo Penta | 3857532 |
| Sierra | 18-5899 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This sender fits various 4-stroke gasoline MerCruiser sterndrive engines, typically including 3.0L, 4.3L, 5.0L, and 5.7L models.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| MerCruiser | 3.0L | Various | 4-Stroke | 815425T/8M0068784 |
| MerCruiser | 4.3L | Various | 4-Stroke | 815425T/8M0068784 |
| MerCruiser | 5.0L | Various | 4-Stroke | 815425T/8M0068784 |
| MerCruiser | 5.7L | Various | 4-Stroke | 815425T/8M0068784 |
Compatible with a range of 4-stroke gasoline Volvo Penta engines, primarily in the 3.0L, 4.3L, 5.0L, and 5.7L families.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | 3.0L | Various | 4-Stroke | 3857532 |
| Volvo Penta | 4.3L | Various | 4-Stroke | 3857532 |
| Volvo Penta | 5.0L | Various | 4-Stroke | 3857532 |
| Volvo Penta | 5.7L | Various | 4-Stroke | 3857532 |
Technical Specs
- Product Type
- Oil Pressure Sender/Sensor
- Installation
- Direct fit, screw-in
- Fuel Type
- Gasoline
- Connection
- 1-wire electrical connector
- Fitting Type
- NPT thread
- Thread Size
- 1/8" NPT
- Working Pressure
- 0-100 PSI
- Warranty
- Varies by brand (typically 1-year limited)
- Other Technical Attributes
- Provides data to oil pressure gauge on dashboard
What’s in the Box
- 1 x Oil Pressure Sender/Sensor (815425T/8M0068784/3857532)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery.
- Locate the existing oil pressure sender. It is often found near the oil filter housing or on the engine block near the distributor.
- Place an oil pan or rag beneath the sender to catch any residual oil.
- Disconnect the single-wire electrical connector from the top of the sender.
- Using an appropriate wrench, carefully unscrew and remove the old sender from the engine block.
- Clean the threaded port on the engine block to ensure a good seal.
- Apply a suitable thread sealant to the threads of the new sender.
- Screw the new sender into the port and tighten it securely. Do not overtighten.
- Reconnect the single-wire electrical connector.
- Reconnect the battery, start the engine, and check for leaks and proper gauge function.
Troubleshooting & FAQ
How do I know if my oil pressure sender is failing?
Common signs of a faulty sender include an oil pressure gauge that reads zero, reads excessively high, or fluctuates erratically. An oil pressure warning light may also illuminate on your dashboard.
Where is this sensor typically located?
On most MerCruiser and Volvo Penta V6/V8 engines, the sender is usually located on the engine block, either near the oil filter or close to the base of the distributor.
Is any special tool required for installation?
A standard deep socket or wrench that fits the sender's hex body is typically all that is needed. Applying thread sealant to the new sender's threads is also recommended for a leak-free installation.
Will this fit my specific engine model year?
This sender is designed for a broad range of model years for the listed engine sizes (3.0L, 4.3L, 5.0L, 5.7L). However, it is crucial to verify compatibility by matching your old part number to the ones listed (815425T, 8M0068784, 3857532) and visually comparing your old part to our product images.
What is the difference between an oil pressure sender and a switch?
A sender (like this one) provides a variable signal to a gauge, showing the actual oil pressure. An oil pressure switch is a simple on/off device that only triggers a warning light when the pressure drops below a set threshold.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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