Faria 90512 — 80 PSI Single Station Oil Pressure Sender | 1/8" NPTF, Standard Ground

Faria 90512 — 80 PSI Single Station Oil Pressure Sender

Overview

The Faria 90512 is a single station oil pressure sender for marine gauge systems, covering a 0–80 PSI range with American-standard resistance. It installs via 1/8" NPTF thread directly into the engine block or an appropriate adapter, and sends oil pressure information to a compatible Faria oil pressure gauge. The standard ground configuration means the sender completes its electrical circuit through metal-to-metal contact with the engine block — no separate ground wire is required, but the thread connection must make clean contact.

Important: Faria senders are not interchangeable between all gauge systems. Before ordering, confirm all three parameters match your existing gauge: station type (single vs. dual), resistance standard (American vs. European), and ground type (standard vs. isolated). Using a sender with the wrong resistance curve or grounding method will cause inaccurate or non-functioning gauge readings even if the sender physically fits.

Cross-References

• Faria: 90512 / F90512
• Crusader / PCM: R020001
• Indmar: 645002
• Marine Power: 456106
• OMC / Volvo Penta: 3857532
• Sierra aftermarket equivalent: Sierra 18-5899

Compatible Applications

• Faria Chesapeake SS Black 2" Oil Pressure Gauge — 80 PSI — compatible gauge
• Faria Chesapeake SS White 2" Oil Pressure Gauge — 80 PSI — compatible gauge
• Faria Dress White 2" Oil Pressure Gauge — 80 PSI — compatible gauge
• Any Faria or compatible single station, American resistance, standard ground oil pressure gauge system requiring an 80 PSI sender
• Crusader, Indmar, Marine Power, OMC, and Volvo Penta applications using cross-reference numbers listed above
• Engines with a 1/8" NPTF oil pressure sender port — a bushing may be used for larger ports without affecting sensing accuracy

Installation Notes

• Install directly into the engine block’s oil pressure sender port, or use an appropriate 1/8" NPTF adapter/bushing for a larger port
• Do not use Teflon tape on the threads — the standard ground design relies on metal-to-metal thread contact with the engine block for its ground path; Teflon tape insulates the threads and will cause inaccurate or zero gauge readings
• Use a T-fitting if the engine also has a separate low-oil-pressure warning switch — both devices can share the same port with an appropriate T-fitting
• A pipe thread sealant compound (not tape) may be used sparingly on the threads if needed for sealing, though many installations run without sealant on short NPTF threads
• Verify gauge polarity and wiring match the single station, standard ground configuration before connecting

Technical FAQ

• What does “standard ground” mean? A standard ground sender completes its electrical circuit through the engine block via its threaded connection, rather than using a separate dedicated ground wire. The engine block must be properly grounded to the negative battery terminal for the sender to function correctly.
• What is “American resistance”? American resistance refers to the SAE J1171 resistance curve used in North American marine gauge systems: approximately 240 ohms at 0 PSI dropping to approximately 33.5 ohms at full scale. European resistance senders use a different curve and are not interchangeable.
• What is the difference between single station and dual station? Single station means the sender is wired to one gauge only. Dual station senders are wired to two gauges simultaneously (e.g., helm and secondary station) and use a different internal resistance configuration. Using the wrong station type will cause reading errors even if everything else matches.
• My new gauge reads incorrectly after replacing the sender — what should I check? First confirm the sender’s resistance standard and station type match the gauge. Then verify the threads are making clean metal-to-metal contact (no Teflon tape). Also check that the engine block is properly grounded to the battery negative terminal.
• Can I use a bushing if my engine has a larger oil pressure port? Yes. Faria confirms that a bushing can be used to adapt a larger port to 1/8" NPTF without affecting pressure-sensing accuracy.

Parts Desk Insights

Best Use Case: This sender is the right choice when replacing a failed or inaccurate oil pressure sending unit on a single-station gauge setup that uses American resistance and a standard ground. It’s also the correct OEM-equivalent replacement for Crusader, Indmar, Marine Power, and OMC/Volvo Penta applications listed in the cross-references above.

Common Issues: The most frequent mistake is using Teflon tape on the threads, which breaks the ground path and causes the gauge to read zero or inaccurately — a very common installation error. The second most common issue is ordering without confirming the station type and resistance standard. A dual station sender (see 80 PSI Dual Station sender) looks identical but uses a different resistance configuration and will not read correctly on a single station gauge system.

Related Products

• Faria Chesapeake SS Black 2" Oil Pressure Gauge — 80 PSI
• Faria Chesapeake SS White 2" Oil Pressure Gauge — 80 PSI
• Faria Dress White 2" Oil Pressure Gauge — 80 PSI
• Faria 80 PSI Oil Pressure Sender — Dual Station
• Sierra 18-5899 Oil Pressure Sender — Single Station
• Faria Chesapeake SS 6-Gauge Inboard Set