Oil Pressure Sender – MerCruiser, Volvo Penta & OMC Engines – 10-32 Stud
Oil Pressure Sender – MerCruiser, Volvo Penta & OMC Engines – 10-32 Stud is backordered and will ship as soon as it is back in stock.
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Oil Pressure Sender – MerCruiser, Volvo Penta & OMC Engines – 1...
Oil Pressure Sender – MerCruiser, Volvo Penta & OMC Engines – 10-32 Stud is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket oil pressure sender is designed for selected MerCruiser, Volvo Penta, and OMC/Cobra stern drive and inboard marine engines. It uses a 10-32 stud terminal and installs into the engine oil-pressure port to send pressure information to a compatible electric gauge.
The sender is listed for specific four-cylinder, six-cylinder, V6, and V8 gasoline engines across the applications below. Because oil-pressure sender specifications can vary by engine and gauge system, verify the original sender, terminal style, thread size, and gauge range before ordering.
- Single aftermarket oil pressure sender.
- 10-32 stud terminal.
- 1/8-27 thread specification for the OMC application listed by the manufacturer.
- For compatible electric oil-pressure gauge systems.
- Sierra aftermarket reference: 18-5899.
Part Number Matrix
The following manufacturer and aftermarket references are associated with this sender. Part-number references do not replace checking the complete engine and gauge specifications.
| Brand | Part Number | Reference Type |
|---|---|---|
| MerCruiser | 815425, 815425T, 8M0068784, 90806, 90806A1 | OEM references |
| Volvo Penta | 3853800, 3857532, 834920, 872063 | OEM references |
| OMC / Johnson Evinrude | 0509445, 0982650, 3853800, 3857532 | OEM references |
| Crusader | 700425 | OEM reference |
| Pleasurecraft | RO20001 | OEM reference |
| Sierra | 18-5899 | Aftermarket reference |
Engine & Model Compatibility
Compatibility is based on the engine brand, engine configuration, horsepower range, production year, terminal type, and sender specification shown below. Confirm all conditions against the engine before installation.
| Brand | Years | Engine Configuration | Horsepower | Terminal / Thread Details |
|---|---|---|---|---|
| MerCruiser | 1963–2014 | 4-cylinder | 100–190 HP | 10-32 terminal |
| MerCruiser | 1963–2014 | 6-cylinder | 140–165 HP | 10-32 terminal |
| MerCruiser | 1963–2014 | V6 | 165–205 HP | 10-32 terminal |
| MerCruiser | 1963–2014 | V8 GM, MIE Scorpion, and Black Scorpion | 190–900 HP | 10-32 terminal |
| Volvo Penta | 1973 and later | 4-cylinder | 72–150 HP | 10-32 terminal |
| Volvo Penta | 1973 and later | 6-cylinder | 190 HP | 10-32 terminal |
| Volvo Penta | 1973 and later | V6 | 180–320 HP | 10-32 terminal |
| Volvo Penta | 1973 and later | V8 | 190–430 HP | 10-32 terminal |
| OMC Cobra | 1968–1998 | 4-cylinder | 80–140 HP | 1/8-27 thread, 10-32 stud terminal, 100 PSI |
| OMC Cobra | 1968–1998 | 6-cylinder | 165 HP | 1/8-27 thread, 10-32 stud terminal, 100 PSI |
| OMC Cobra | 1968–1998 | V6 | 150–205 HP | 1/8-27 thread, 10-32 stud terminal, 100 PSI |
| OMC Cobra | 1968–1998 | V8 GM | 170–454 HP | 1/8-27 thread, 10-32 stud terminal, 100 PSI |
Technical Specs
- Product Type
- Oil pressure sender / sensor
- Product Quantity
- One sender
- Terminal Type
- 10-32 stud terminal
- Thread Specification
- 1/8-27 thread for the listed OMC application
- Gauge Compatibility
- Use with the electric oil-pressure gauge specified for the engine and sender system
- OMC Application Rating
- 100 PSI for the listed OMC/Cobra application
- Aftermarket Reference
- Sierra 18-5899
What’s in the Box
- 1 x Oil pressure sender
Installation Notes
- Switch off the engine, disconnect the battery, and allow the engine to cool before beginning work.
- Locate the existing oil pressure sender on the engine block and place an absorbent cloth beneath it.
- Disconnect the electrical wire from the sender terminal.
- Remove the old sender with the correct wrench. Avoid damaging the engine-block threads.
- Compare the replacement sender with the original, including terminal style, thread, and application rating.
- Apply only a suitable marine-grade thread sealant if required by the engine or sender installation instructions. Keep sealant away from the electrical terminal.
- Start the replacement sender by hand to prevent cross-threading, then tighten it securely without overtightening.
- Reconnect the electrical wire and battery.
- Run the engine and inspect the sender for oil leaks. Confirm that the gauge responds correctly and remains within the expected range.
Troubleshooting & FAQ
What does an oil pressure sender do?
The sender converts engine oil pressure into an electrical signal for the compatible oil-pressure gauge. A failed sender can cause an inaccurate, erratic, or absent gauge reading.
Does this sender fit every MerCruiser, Volvo Penta, or OMC engine?
No. It fits only the applications and conditions listed above. Confirm the engine year, configuration, horsepower, terminal type, thread, and gauge specification before ordering.
Is the sender rated at 80 PSI or 100 PSI?
The manufacturer specifically lists a 100 PSI specification for the OMC/Cobra application. A single pressure rating should not be assumed for every MerCruiser or Volvo Penta application. Match the sender to the gauge and engine application specified for your vessel.
What terminal does this sender use?
The listed applications use a 10-32 stud terminal. Verify that your original sender uses the same terminal arrangement before installation.
Should I use thread sealant?
Use a small amount of sealant only when required for the application and compatible with marine engine service. Do not allow excess sealant to enter the oil passage, and do not overtighten the sender.
What should I do if the gauge still reads incorrectly after replacement?
Stop operating the engine if the oil-pressure warning is abnormal. Check the wiring, gauge compatibility, sender terminal, engine-block threads, oil level, and actual oil pressure. A mechanical pressure test may be needed to distinguish a sender or gauge fault from a genuine engine lubrication problem.
Safety & Important Info
- Verify the complete engine and sender specifications before purchasing; model family or horsepower alone does not confirm fitment.
- This is an aftermarket replacement sender, not an original equipment component.
- Do not use a gauge reading alone to diagnose engine condition. Investigate abnormal oil-pressure readings promptly.
- Professional installation is recommended when access is restricted or when the correct thread, gauge range, or wiring cannot be confirmed.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine engine and stern drive applications.
- Application-Focused Listings — Product details are organized around engine configuration, terminal style, thread specification, and reference numbers.
- Support for Fitment Checks — Compare the original component and complete engine information before installation.
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