Sierra Oil Pressure Sender Single Station SIE-18-5899
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Sierra 18-5899 is a single-station marine oil pressure sender for use with compatible 0–80 PSI oil pressure gauges. It is designed to send engine oil pressure information to one gauge and is commonly used as a replacement sender across Mercury MerCruiser, Volvo Penta, OMC, Crusader, PCM, Indmar, and other marine engine applications where the thread, range, and gauge scale match. Current references list this sender with Sender Code C, 1/8"-27 NPT thread, and a 10-32 stud terminal.
Key Features
- Single-station oil pressure sender for one gauge
- 0–80 PSI pressure range
- Sender Code C
- 1/8"-27 NPT thread size
- 10-32 stud terminal
- Works with compatible U.S. ohm-scale oil pressure gauges
- Common 240–33 ohm / S.W. match style reference for supported gauge systems
- Sierra part number: 18-5899 / SIE-18-5899
Engine Compatibility
This sender is commonly referenced for compatible Mercury MerCruiser, Volvo Penta, OMC, Crusader, Pleasurecraft / PCM, Indmar, Marine Power, Stewart Warner, VDO, Faria, Datcon, Medallion, and VeeThree / SeaStar gauge applications. It should be matched by pressure range, thread size, terminal type, sender code, and gauge resistance scale, not by engine brand alone.
Serial Number Fitment Notice
Oil pressure sender fitment can vary by engine model, gauge type, harness, sender location, and whether the boat uses a single-station or dual-station gauge setup. Always confirm compatibility using the engine serial number and the existing sender specifications before ordering.
When This Part Needs Replacement
Replace the oil pressure sender if the 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 verify actual engine oil pressure before assuming the sender is the only issue.
Installation Notes
Confirm the engine is off and cool before service. Match the original sender’s thread size, pressure range, and terminal style before installation. Use thread sealant only where appropriate, and avoid over-applying sealant because the sender may require proper grounding through the threads depending on the installation. After installation, verify gauge operation and inspect for oil leaks.
Alternate/Superseded Part Numbers
- Sierra 18-5899
- SIE-18-5899
- Crusader 700425
- Crusader / PCM R020001
- Indmar 645002 / 64-5002
- MerCruiser 34623
- MerCruiser 815425
- MerCruiser 815425T
- MerCruiser 8M0068784
- MerCruiser 90806
- MerCruiser 90806A1
- OMC 172127
- OMC 3853800
- OMC / Volvo Penta 3857532
- OMC 982650
- Faria 90512
- Datcon 02504-00
- Medallion A-2547
- Stewart Warner 279-A / 279A
- VDO 360801
- VeeThree / SeaStar IA15001
Parts Desk Insight
The important match on this sender is not just the engine brand. It needs to match the gauge range, sender code, station count, thread size, and terminal style. A single-station sender should not be swapped into a dual-station setup unless the gauge system specifically supports it.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.