SKU: 55636113586

881879T26 Water Pressure Sensor for Mercury | JLM Marine

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Description

881879T26 Water Pressure Sensor for Mercury | JLM MarineWater Pressure Sensor Fits Mercury 135400 HP Outboards 881879T26 This water pressure sensor is designed for Mercury outboard engines ranging from 135 HP to 400 HP. It provides accurate pressure readings to monitor your engine's cooling system performance and prevent overheating damage. Engineered as a direct replacement, this sensor integrates seamlessly with your existing setup. This aftermarket sensor directly replaces Mercury Marine part numbers

Water Pressure Sensor – Fits Mercury 135–400 HP Outboards | 881879T26

This water pressure sensor is designed for Mercury outboard engines ranging from 135 HP to 400 HP. It provides accurate pressure readings to monitor your engine's cooling system performance and prevent overheating damage. Engineered as a direct replacement, this sensor integrates seamlessly with your existing setup.

This aftermarket sensor directly replaces Mercury Marine part numbers 881879A19, 881879A20, 881879T26, and 8M6000639, offering reliable performance at a competitive price point.

  • Compatible with Mercury 135 HP through 400 HP outboard engines
  • Direct-fit replacement for multiple OEM part numbers
  • Monitors water pressure in engine cooling system

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket sources:

Brand Part Number
Mercury Marine 881879A19
Mercury Marine 881879A20
Mercury Marine 881879T26
Mercury Marine 8M6000639

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Brand Rated HP OEM Part No.
Mercury Marine 135 HP 881879T26
Mercury Marine 150 HP 881879T26
Mercury Marine 175 HP 881879T26
Mercury Marine 200 HP 881879T26
Mercury Marine 225 HP 881879T26
Mercury Marine 250 HP 881879T26
Mercury Marine 275 HP 881879T26
Mercury Marine 300 HP 881879T26
Mercury Marine 350 HP 881879T26
Mercury Marine 400 HP 881879T26

Technical Specifications

Specification Value
Part Type Water Pressure Sensor
Application Mercury Outboard Engines
Compatible HP Range 135 HP – 400 HP
OEM Part Numbers Replaced 881879A19, 881879A20, 881879T26, 8M6000639

Package Contents

Your package includes:

  • 1 × Water Pressure Sensor

Installation Guide

  1. Disconnect the battery to ensure safe working conditions before beginning any electrical work on your outboard.
  2. Locate the existing water pressure sensor on your Mercury engine. It is typically mounted on the cylinder head or cooling system housing.
  3. Disconnect the electrical connector from the old sensor by gently pressing the release tab and pulling it free.
  4. Remove the old sensor by turning it counterclockwise with an appropriate wrench or socket. Be prepared for minor water spillage.
  5. Clean the mounting threads on the engine block to remove any debris, old sealant, or corrosion.
  6. Apply marine-grade thread sealant to the threads of the new sensor if required by your engine's service manual.
  7. Install the new water pressure sensor by threading it clockwise into the mounting hole and tightening to the manufacturer's specified torque.
  8. Reconnect the electrical connector to the new sensor, ensuring it clicks securely into place.
  9. Reconnect the battery and start the engine to verify proper sensor operation.
  10. Check your gauge or display to confirm that water pressure readings appear normal during engine operation.
  11. Inspect for leaks around the sensor after the engine has warmed up and the cooling system is under full pressure.

Troubleshooting & FAQ

Q: How do I confirm this sensor fits my Mercury engine?
A: Verify your engine's horsepower rating falls within the 135–400 HP range listed in the compatibility table. Cross-reference your original part number (881879A19, 881879A20, 881879T26, or 8M6000639) with the part number cross-reference table above.

Q: What are the signs that my water pressure sensor has failed?
A: Common symptoms include inaccurate or erratic pressure readings on your gauge, no pressure reading at all, or warning alarms/lights indicating low water pressure even when the cooling system is functioning properly. If your engine is overheating despite adequate water flow, a faulty sensor may also be the cause.

Q: How often should I replace the water pressure sensor?
A: Water pressure sensors typically do not require scheduled replacement and should last many years under normal conditions. Replace the sensor if you experience faulty readings, corrosion damage, or as part of troubleshooting cooling system issues.

Q: Can I install this sensor myself or do I need a mechanic?
A: If you are comfortable with basic outboard maintenance and have the proper tools, you can install this sensor yourself by following the installation guide. However, professional installation is recommended if you are unfamiliar with electrical connections or engine cooling systems.

Q: Is this an OEM part or an aftermarket replacement?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 55636113586

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Amazon Customer
Fort Morgan, US
★★★★★ 5
Great
Size: Medium, Number of Items: 1
I need something that was soft for my three year old and this ball is super great, it not only is the right size but it also fits in his mouth just right. Although he is a super aggressive chewer, the ball toy hasn't been totally destroyed yet and it is easy on his gums. The ball is so durable that got two of these toys just for fun.
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Reviewed in the United States on May 10, 2026
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WMiracle
Phoenix, US
★★★★★ 5
The best!
UPDATE: 08/05/2025 - This is still one of my dog's 2 fav training/play toys. A couple of notes: 1. This is not a chew toy. If your pup is chewing up the rope, that's on you. That being said, you can get 100' of the poly cord rope at Home Depot for like $4.98. You can make nearly 100 ropes out of 100'. How hard is it to replace the rope????? 2. My pup is a now 15 month old Malinois. His original balls, purchase in September 2024 are still in everyday, multiple times per day, play. I did get careless and leave one where he got it and chew the rope. Easily replaced. Nothing to fret over. Yes, that was on me! 3.The foam ball is virtually indestructible! Replace the rope! 4. I noticed the price for the yellow large went from $12 each to $24. THIS will cause me to go elsewhere if they doubled in price. I LOVE these balls but not that much. I noticed they have a new yellow ball that has a strap vs. a rope. I might try that if I need one, but I have 6 of these balls, 2 never used yet, 2 that are virtually new looking, and 2 that have been in play since september 2024. I don't think I'll be buying more any time soon, but if I do need more, I hope they haven't gone up to $24 each. One of my top, go-to training tools. Quality is great other than the shrink wrap around the string joint. It's junk but not essential. Great tug and fetch toy. Essential to teaching a good "out" command (2 are recommended for this).
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Reviewed in the United States on January 11, 2025
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Rosalie
Massapequa, US
★★★★★ 5
Best dog ball
This is our go to dog toy for our German shepherd. its great for training in sports as well as outings at the beach, considering it floats! Never had him destroy one, so its extremely durable. I like that its a bright color so its easier to locate when i accidently let go of the rope too late and end up whipping it 20 ft into the woods. Easy to clean, all around just a great toy. Also love the large size as having a dog accidently lodge a ball into its throat is a real fear of mine, I do not have to worry about that with this toy. I should also mention the rope is a must, as touching a slobbery ball isn't the greatest feeling in the world and it puts your hands out of harms way. I will forever order these.
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Reviewed in the United States on September 7, 2025
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Mavis Adam
Chelsea, US
★★★★★ 4
Great ball, bad rope
Size: Medium, Number of Items: 1, Size: Medium, Number of Items: 1
My dog and I love the starmark ball on a rope tug toys. While this is one of the best tug toys we have found, I am continually disappointed with the quality of the rope. The plastic sleeve comes off the first day, and after that the stitching begins to weaken until the rope ends come apart and the rope slides out of the ball. Is there a way to improve this design so that this toy lasts longer? My dog is not left alone with the toy, it is only used as an interactive tug toy as a training reward. I am updating my review now several months later. I reinforced the rope with a paracord braid and the toy now lasts a very long time. My dog and I play with this toy everyday on our morning hike. He is a large German Shepherd with high ball drive. He carries this ball in his mouth several miles on our morning hike. We play fetch in the fields near our home and in the lake beyond the fields with this toy every day. This toy is his reward in obedience training and we play a lot of tug with it every day. Reinforcing the handle has made a huge difference as the toy lasts and lasts now with the improved rope. Great ball, we will always have a collection of them at our house!
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Reviewed in the United States on September 19, 2020
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AGJ
San Leandro, US
★★★★★ 5
Great for training and play!
Size: Medium, Number of Items: 1
My German shepherd love this toy! Great to take on walks with you as light weight and can fit in your pocket. Stands up to the toughest of play. Great as reward toy for training in place of treats! We always have one on hand at home or out and about!
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Reviewed in the United States on March 18, 2026

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