Stewart Warner Oil Pressure Sender 0-100 PSI 279B-F
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The 279B-F is a 0–100 PSI electrical oil pressure sender commonly used with compatible Stewart Warner, Teleflex-style, SeaStar/VeeThree, Faria, Datcon, VDO, MerCruiser, and Sierra marine gauge systems. It is a threaded pressure sender designed to convert engine oil pressure into a gauge signal for compatible 240–33 ohm oil pressure gauges. Stewart Warner lists the 279B-F with a 0–100 PSI range, 240–33 ohm resistance, 1/8" NPTF mounting thread, and 10-32 stud terminal.
Key Features
- 0–100 PSI oil pressure sender
- 240–33 ohm resistance range
- 1/8" NPTF mounting thread
- 10-32 stud terminal
- Single electrical sender for compatible oil pressure gauges
- Thick-film sender design for long service life
- Suitable for compatible 12V gauge systems
- Can be mounted in any orientation where clearance allows
- Stewart Warner part number: 279B-F
Engine Compatibility
This sender is not engine-brand specific. It should be matched by gauge resistance range, pressure range, thread size, sender code, terminal type, and station setup. Marine cross-reference listings show 279B-F as interchangeable with several 100 PSI marine oil pressure sender references, including MerCruiser 850362, Faria 90519, Datcon 02505-00, VDO 360811, and VeeThree / SeaStar IA15016 where the gauge system specifications match.
Serial Number Fitment Notice
Oil pressure sender fitment can vary by engine model, gauge style, harness, sender location, and whether the boat uses a single-station or multi-station instrument setup. Always confirm the existing sender specifications and gauge range before ordering. The sender resistance range must match the gauge or cluster it is being used with.
When This Part Needs Replacement
Replace the sender if the oil pressure gauge reads incorrectly, pegs high or low, fluctuates without matching actual engine oil pressure, leaks at the sender body, has a damaged terminal, or fails diagnostic testing. Always confirm actual engine oil pressure before replacing the sender so a real lubrication issue is not mistaken for an electrical sender problem.
Installation Notes
Confirm the original sender is a 0–100 PSI, 240–33 ohm, 1/8" NPTF, 10-32 stud unit before installation. Use thread sealant only where appropriate and avoid over-applying it, since sender grounding and gauge accuracy can be affected on some installations. After installation, verify gauge operation and inspect for oil leaks at the threaded port.
Alternate / Superseded Part Numbers
- 279B-F
- Stewart Warner 279B-F
- Faria 90519
- Datcon 02505-00
- MerCruiser 850362
- VDO 360811
- VeeThree / SeaStar IA15016
- Sierra OP24301 — marine replacement reference for compatible 100 PSI systems
Parts Desk Insight
The important match on this sender is the gauge signal, not just the thread size. A sender that threads in physically can still read wrong if the pressure range or ohm curve does not match the gauge.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.