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Oil Pressure Sensor 8M0210755 – MerCruiser 4.3L 5.0L 5.7L
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How to Match This Part
This aftermarket oil pressure sensor replaces MerCruiser / Mercury / Quicksilver 8M0210755 (catalog form 87-8M0210755). Mercury superseded earlier oil-sensor kit number 864252A01 (87-864252A01) to this current number. It is the oil-pressure safety switch used on MerCruiser V6 and V8 engines with electric fuel pumps — not a variable-resistance gauge sender, and not the separate audio-warning alarm switch.
Match this part in this order:
1. OEM number on the removed sensor/kit or in your parts catalog — 8M0210755, 87-8M0210755, 864252A01, 87-864252A01, or legacy switch 805024
2. Fuel system — MerCruiser sterndrive or inboard with an electric fuel pump (not mechanical pump applications)
3. Displacement family — MerCruiser 4.3L, 5.0L (305 CID), or 5.7L (350 CID) calling for this oil-sensor kit
Confirm the OEM number and that your engine uses an electric fuel pump before ordering. See the product images to compare physical form once media are uploaded.
Part Number Cross-Reference
Use this table to confirm equivalent MerCruiser numbers in the 8M0210755 supersession path and a common aftermarket cross.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| Primary OEM Reference | Mercury / MerCruiser / Quicksilver | 8M0210755 | Current KIT-OIL SENSOR (also 87-8M0210755) |
| OEM supersession | Mercury / MerCruiser / Quicksilver | 864252A01 | Earlier oil sensor kit; superseded by 8M0210755 (also 87-864252A01) |
| OEM supersession | Mercury / MerCruiser | 805024 | Legacy oil pressure switch replaced by this sensor kit harness |
| Aftermarket | EMP | 1300-03773 | Aftermarket oil sensor cross for 87-864252A01 / 8M0210755 path |
Part numbers are listed for identification only. This is an aftermarket part manufactured by JLM Marine and is not sold as a genuine Mercury or MerCruiser component.
Compatible Engine Models
Confirm your engine model and serial number before ordering. On MerCruiser sterndrive and inboard engines, the identification plate and serial number are on the engine itself — typically on the cylinder block or flame-arrestor cover — not on an outboard transom bracket. Cross-check with the Mercury Parts Diagrams for your MerCruiser engine group.
This sensor serves the electric fuel pump oil-pressure safety circuit. It is not for engines with mechanical fuel pumps, and it is not the audio-warning alarm switch used on other MerCruiser oil-pressure circuits.
| Brand | Application | Notes |
|---|---|---|
| MerCruiser | 4.3L V6 with electric fuel pump | Calling for 8M0210755 or superseded 864252A01 |
| MerCruiser | 5.0L V8 (305 CID) with electric fuel pump | Sterndrive / inboard electric-pump applications |
| MerCruiser | 5.7L V8 (350 CID) with electric fuel pump | Sterndrive / inboard electric-pump applications |
Important: Verify the OEM number on your removed sensor or parts catalog. Engines with mechanical fuel pumps, gauge-only senders, or a different oil-pressure switch should not use this listing.
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Oil pressure sensor (electric fuel pump safety) |
| Primary OEM number | 8M0210755 |
| Mercury catalog form | 87-8M0210755 |
| Supersedes | 864252A01 (87-864252A01); replaces legacy 805024 switch setup |
| Engine family | MerCruiser V6 / V8 with electric fuel pumps |
| Function | Oil-pressure safety control for the electric fuel pump circuit |
Installation Guide
Allow the engine to cool fully. Disconnect the battery negative cable before working on the fuel-pump or oil-pressure circuit.
Label and disconnect the wiring from the old oil pressure sensor or switch. Unscrew the old unit and compare its thread, connector style, and OEM number to this 8M0210755 replacement. Do not force a mismatched thread.
Install the new sensor by hand, then tighten snugly with the correct wrench on the body hex — do not over-torque. Reconnect the harness per your MerCruiser wiring diagram.
Reconnect the battery, start the engine, and confirm the electric fuel pump runs with oil pressure present and that there are no oil leaks at the port.
Note: If you are unsure about fuel-pump safety wiring or oil-gallery location, have a marine technician complete the install. Always follow your engine service manual.
Troubleshooting & FAQ
Why Choose JLM MARINE?
- Precision Fit: Matched to MerCruiser 8M0210755 oil pressure sensor applications and the verified 864252A01 supersession path.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: Aftermarket marine parts engineered for reliable electric fuel-pump safety service.
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