Oil Pressure Sensor Switch Kit – Fits MerCruiser V-6 & V-8 Engines (Replaces 87-864252A01, 8M0210755)
Oil Pressure Sensor Switch Kit – Fits MerCruiser V-6 & V-8 Engines (Replaces 87-864252A01, 8M0210755) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Oil Pressure Sensor Switch Kit – Fits MerCruiser V-6 & V-8 Engi...
Product Details
This Oil Pressure Sensor Switch Kit is an essential replacement for MerCruiser V-6 and V-8 (305/350 CID) engines from the 1990s through the 2000s that are equipped with electric fuel pumps. The sensor plays a critical role in engine safety by monitoring oil pressure and controlling the fuel pump circuit.
It serves as a direct aftermarket replacement for Mercury and Quicksilver part numbers 87-864252A01 and 8M0210755.
- Installs directly onto the engine block.
- Designed for gasoline engines with electric fuel pumps.
- The kit includes the sensor and a connector with pigtails and spade connectors for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Quicksilver | 87-864252A01 |
| Mercury/Quicksilver | 8M0210755 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this switch fits a wide range of V-6 and V-8 models from the 1990s and later that use an electric fuel pump.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| MerCruiser | 262TBI Alpha | 4-Stroke | 1996–1997 | 87-864252A01 |
| MerCruiser | 262TBI Bravo | 4-Stroke | 1996–1997 | 87-864252A01 |
| MerCruiser | 4.3L Alpha I | 4-Stroke | 1992–1995 | 87-864252A01 |
| MerCruiser | 4.3L Alpha | 4-Stroke | 1993–1998 | 87-864252A01 |
| MerCruiser | 4.3L Bravo | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 4.3LH Alpha | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 4.3LH Bravo | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 4.3LX Alpha I | 4-Stroke | 1992–1995 | 87-864252A01 |
| MerCruiser | 4.3LX Alpha | 4-Stroke | 1993–1998 | 87-864252A01 |
| MerCruiser | 4.3LX Bravo | 4-Stroke | 1996–1997 | 87-864252A01 |
| MerCruiser | 4.3LXH Alpha | 4-Stroke | 1996–1997 | 87-864252A01 |
| MerCruiser | 4.3LXH Bravo | 4-Stroke | 1996–1997 | 87-864252A01 |
| MerCruiser | 5.0L Alpha | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 5.0L Bravo | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 5.7L Alpha | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 5.7L Bravo | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 350 MAG [SKI] | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 5.7L [CARB SKI] | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 5.7L [CARB] | 4-Stroke | 1998 | 87-864252A01 |
| MerCruiser | 5.7L [SKI] | 4-Stroke | 1998 | 87-864252A01 |
Technical Specs
- Product Type
- Oil Pressure Sensor Switch Kit
- Installation
- Engine block mounting
- Fuel Type
- Gasoline
- Connection
- Electrical connector with pigtails and spade connectors
- Dimensions
- 8.2" L x 6.0" W x 5.5" H
- Warranty
- 1 year (aftermarket version)
- Other Technical Attributes
- Used on MerCruiser engines with electric fuel pumps
What’s in the Box
- 1 x Oil Pressure Sensor (Replaces 87-864252A01/8M0210755)
- 1 x Connector with pigtails and spade connectors (included in kit)
Installation Notes
- Disconnect the boat's battery before beginning any electrical work.
- Locate the existing oil pressure sensor on the engine block. It is typically found near the oil filter.
- Place a rag or container underneath the sensor to catch any dripping oil.
- Carefully disconnect the electrical connector from the old sensor.
- Using an appropriate wrench, unscrew and remove the old sensor from the engine block.
- Apply thread sealant to the threads of the new sensor, if not already pre-applied.
- Screw the new sensor into the engine block and tighten it to the manufacturer's recommended torque specification. Do not overtighten.
- Connect the new wiring harness to the sensor and splice the pigtail leads into the engine's wiring, ensuring a secure connection.
- Reconnect the battery.
- Start the engine and check for any leaks around the new sensor and verify that the oil pressure gauge or warning light functions correctly.
Troubleshooting & FAQ
How do I know if my oil pressure sensor is failing?
Common signs of a faulty oil pressure sensor include an oil pressure gauge that reads zero, is stuck at maximum, or fluctuates erratically. Additionally, the engine's electric fuel pump may not activate if the sensor fails to detect oil pressure, preventing the engine from starting or causing it to stall.
What is the primary function of this sensor switch?
This component is a safety device. It serves two purposes: it sends the oil pressure reading to the gauge on your dashboard, and more importantly, it acts as a switch to power the electric fuel pump. The pump will only run when the sensor detects adequate oil pressure, preventing the engine from running without lubrication.
Will this fit my specific MerCruiser engine model?
This kit is designed for a broad range of V-6 and V-8 MerCruiser engines from the 1990s and 2000s that use an electric fuel pump. Please check the compatibility table on this page and compare the part number (87-864252A01) against your service manual to ensure an exact match.
Is professional installation necessary?
While installation can be performed by experienced DIY mechanics, professional installation is always recommended to ensure proper torque, secure electrical connections, and prevent oil leaks. Improper installation can lead to engine damage.
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.
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