Sierra 18-5896 - Single-Station Temperature Sender, 1/8 NPT
Sierra 18-5896 - Single-Station Temperature Sender, 1/8 NPT
Sierra
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Sierra 18-5896 - Single-Station Temperature Sender, 1/8-Inch NPT
A temperature gauge needs a sender with the correct resistance characteristics as well as the right mounting thread. Sierra 18-5896 sends the engine-temperature signal to a compatible US-ohm-scale gauge in a single-station installation. Its listed resistance points are 176 ohms at 100°F and 24 ohms at 220°F, with a 1/8-inch NPT mounting thread and 10-32 stud terminal. Match these details to the installed gauge and engine before replacing the sender.
Part Specifications
- Part Number: 18-5896
- Component: Engine temperature gauge sending unit
- Station Configuration: Single station
- Mounting Thread: 1/8-inch NPT
- Electrical Connection: 10-32 stud terminal
- Gauge Compatibility: Compatible US-ohm-scale temperature gauges
- Listed Resistance: 176 ohms at 100°F; 24 ohms at 220°F
- Replaces Westerbeke: 35109
- Replaces Stewart Warner: 280EA
- Replaces Sierra: 23-5840
Confirm Fitment Before Ordering
Use the parts diagrams available on our website to identify the temperature sender required for your engine. Alternatively, send us your engine model and serial number by email, text or live chat, and we'll confirm fitment before you order; include your gauge identification and whether the installation has one or two gauge stations.
Additional Information
- Vendor: Sierra
- Part Number: 18-5896
- OEM Cross-Reference: Westerbeke 35109; Stewart Warner 280EA
- Previous Sierra Part Number: 23-5840
Installation Notes
Refer to the applicable engine and instrument service manuals for sender installation, electrical connection, sealing requirements and specified gauge checks.
Frequently Asked Questions
Q: Is this sender specified for one gauge station or two?
A: It is listed for a single-station installation. Dual-station compatibility is not established; select the sender required by the actual instrument arrangement.
Q: Which resistance values should I compare with my gauge specifications?
A: The source lists 176 ohms at 100°F and 24 ohms at 220°F. Compare the gauge manufacturer's sender requirements rather than assuming all US-scale gauges are identical.
Q: Do 100°F and 220°F define the full operating range?
A: They are the two supplied resistance reference points, not an established minimum and maximum operating range.
Q: What mounting and terminal connections does it use?
A: The listed mounting thread is 1/8-inch NPT, and the electrical connection is a 10-32 stud terminal. Verify both against the installed system.
Q: Is this a temperature gauge or an overheat alarm switch?
A: The listing identifies a sending unit that supplies a temperature-gauge signal, not a gauge or a specified alarm switch. Do not substitute it into another circuit without verifying that circuit's requirements.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.