DUZFOREI Oil Pressure Sender for Volvo Penta Mercury Mercruiser - 1/8"-27 NPT, 10-32 Stud, 0-80 PSI

DUZFOREI oil pressure sender is a direct-fit replacement sensor that restores accurate oil pressure readings for Volvo Penta, Mercury Mercruiser and OMC marine engines.

When a failing oil pressure sender causes unreliable gauge readings or warning lights on your boat dash, this DUZFOREI sending unit offers an affordable, precision-engineered swap. Built to the factory thread and electrical specifications, it’s compatible with a wide range of gasoline marine engines from small 3.0L blocks to larger V6 and V8 platforms. This listing covers the common OEM reference numbers so you can cross-check fitment quickly before purchase.

How do I know this sensor will fit my engine?

Check the thread size, terminal type and OEM cross-references to confirm compatibility. This sender uses a 1/8"-27 NPT thread and a 10-32 stud terminal, matching many Mercury, Mercruiser, Volvo Penta and OMC applications listed below.

• Thread: 1/8"-27 NPT — standard marine oil sender thread
• Terminal: 10-32 stud — fits typical gauge wiring
• Resistance range: 0–300 ohms mapped to 0–80 psi — matches factory electrical curves
• OEM cross-reference: replaces 815425T, 3857532, 18-5899, 8M0068784, and related numbers

What performance and electrical specs should I expect?

This sending unit is calibrated to capture up to 80 psi of oil pressure and translates that pressure into a resistance between 0 and 300 ohms for your gauge. That makes it suitable for most recreational marine gas engines where accurate dash readings are important for safe operation.

• Maximum indicated pressure: 80 psi
• Resistance output: 0–300 ohms across the pressure range
• Electrical terminal: 10-32 stud for secure gauge connection
• Durable construction intended for marine environments when installed properly

Which engine models and part numbers does this unit replace?

This DUZFOREI sender is manufactured as a direct substitute for many Mercury/Mercruiser, Volvo Penta and OMC part numbers, covering common V6 and V8 marine engines plus several inline units. Use the cross-reference list to match against the part currently installed on your engine or the OEM part number in your manual.

• Mercury/Mercruiser replacements: 815425T, 8M0068784, 34623, 87-815425T
• Volvo Penta & OMC replacements: 3857532, 18-5899, 34623OMC, 3853800
• Fits engines: 3.0L, 4L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L, and common V6/V8 marine blocks
• Always verify with your engine’s service manual before ordering

How do I install the sender and avoid common mistakes?

Installation is straightforward with basic hand tools, but proper sealing and wiring are essential to prevent leaks and false readings. Replace the unit only when the engine is cool, and use thread sealant appropriate for pressure sender fittings; do not overtighten the sensor body.

• Turn off the engine and relieve pressure before removal
• Use compatible thread sealant or PTFE tape sparingly on the 1/8"-27 NPT thread
• Connect the gauge lead to the 10-32 stud and secure the ground per your boat wiring diagram
• Check for leaks and verify gauge response at startup

Who this is for: This DUZFOREI oil pressure sender is aimed at boat owners, marine mechanics and DIY enthusiasts who need an economical, direct-replacement oil pressure sensor for Mercury, Mercruiser, Volvo Penta and OMC engines. It’s ideal when the original sender has failed, produces erratic gauge readings, or when restoring older vessels where OEM parts are no longer readily available. Always confirm fitment against your engine’s part number list before purchase to ensure correct operation.