Oil Pressure Sender Sensor Sending Unit For Volvo Penta

RICHWEI oil pressure sender is a direct-fit replacement sensor that reports engine oil pressure for Volvo Penta, Mercury/Mercruiser and OMC marine engines (fits many 3.0L–8.2L V6/V8 models).

This compact, threaded sender is built to restore accurate oil-pressure readings on a range of inboard and sterndrive marine engines. Designed with a 1/8"-27 NPT thread and a 10-32 stud electrical terminal, the unit matches the common factory specifications for popular part numbers such as 815425T, 3857532, 8M0068784 and others. Its resistance curve covers 0–300 ohms with an 80 psi range, making it compatible with dash gauges and monitoring systems used across multiple boat engine families.

Will this sender fit my engine model?

Check the thread, electrical terminal and the OEM cross-reference numbers. The sender uses a 1/8"-27 NPT thread and a 10-32 stud terminal—standard for many marine oil pressure ports—and replaces numerous OEM references across Mercury/Mercruiser, Volvo Penta and OMC.

• Threads: 1/8"-27 NPT for direct installation
• Terminal: 10-32 stud for common gauge connectors
• OEM cross-refs: 815425T, 3857532, 8M0068784, 90806, 834920, 0509445, etc.
• Engine sizes covered: 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L and common 4L/V6/V8 configurations

How accurate and durable is the measurement?

The sender provides a resistance output across 0–300 ohms with an 80 psi maximum range, matching the electrical behavior expected by most marine dashboards. Its metal body and sealed design resist engine bay conditions, giving stable readings when properly installed and connected.

• Resistance range: 0–300 ohms for standard gauge compatibility
• Pressure range: up to 80 psi for typical marine oil systems
• Sealed housing to reduce moisture and oil ingress risks
• 10-32 stud ensures reliable electrical contact

What’s involved in installing this replacement sender?

Installation is straightforward for a mechanically inclined boater or a marine technician: remove the old sender, confirm thread compatibility, apply proper thread sealing, and reconnect the gauge lead to the 10-32 stud. No special tools are required beyond common wrenches and thread sealant.

• Tools: wrench for 1/8"-27 NPT fitting and small terminal wrench for stud
• Prep: clean port, use marine-grade thread sealant sparingly
• Connection: attach gauge wire to 10-32 stud and secure with nut
• Test: run engine and verify steady gauge response

Which factory part numbers does this unit replace?

This sender is manufactured to be compatible with many OEM part numbers used by Mercury/Mercruiser, Volvo Penta and OMC, making it a convenient aftermarket replacement for several discontinued or hard-to-find originals. Always compare part numbers before ordering to confirm fitment.

• Mercury/Mercruiser refs: 815425T, 8M0068784, 815425, 90806, 90806A1
• Volvo Penta refs: 3853800, 3857532, 834920, 872063
• OMC refs: 0509445, 0982650, 3857532
• Also cross-compatible with many OEM catalog numbers listed by manufacturers

Who is this for: boat owners, marine mechanics and service shops seeking a reliable, direct-replacement oil pressure sender for small to mid-size inboard and sterndrive engines. If you need to restore accurate oil-pressure readings on Volvo Penta, Mercury/Mercruiser or OMC-powered craft—especially models in the 3.0L through 8.2L range—this sender offers a cost-effective, specification-matching solution. Confirm your engine’s thread type and cross-reference numbers before purchase to ensure a correct fit.