DUZFOREI Oil Pressure Sender Replacement for Mercury/Volvo Penta Mercruiser — 1/8"-27 NPT, 0–300Ω

DUZFOREI oil pressure sender sensor is a direct-fit replacement sending unit that measures engine oil pressure for Mercury/Mercruiser, OMC and Volvo Penta marine engines.

If your boat’s oil pressure gauge is reading erratically or the warning lamp is activating without cause, a worn or failed sender is often the culprit. This DUZFOREI sender replaces multiple OEM part numbers and fits a wide range of V6 and V8 marine engines, offering a straightforward swap with standard 1/8"-27 NPT threading and a 10-32 stud electrical terminal. The sender converts hydraulic oil pressure into an electrical signal across a resistance range, giving compatible gauges and engine control systems reliable feedback.

How does this sender match my Mercury or Mercruiser engine?

This unit is manufactured to replace common OEM senders used across Mercury and Mercruiser models. It uses the same thread size and terminal type as many original units so installation is generally plug-and-play when the engine’s mating threads and wiring match.

• Thread size: 1/8"-27 NPT for standard gauge ports
• Terminal: 10-32 stud for secure electrical connection
• Resistance output: 0–300 ohms to mirror factory sender ranges
• Direct replacements: includes part numbers like 815425T, 8M0068784, 34623

Will it fit my Volvo Penta or OMC engine model?

Yes—the DUZFOREI sender covers many Volvo Penta and OMC applications across multiple engine displacements. Cross-reference the listed replacement part numbers with your engine manual or the old sender to ensure compatibility before installation.

• Replaces Volvo Penta / OMC numbers: 3857532, 18-5899, 3853800 and others
• Compatible with engine sizes: 3.0L, 4.3L, 4.0L, 5.0L, 5.7L, 7.4L, 8.2L
• Suitable for V6 and V8 configurations commonly used in marine drives
• Always verify fitment visually or with part cross-reference before ordering

What are the technical specs and how will they affect gauge readings?

The sender provides a pressure-to-resistance characteristic that many aftermarket and OEM gauges expect. It reads up to 80 psi and produces a resistance range that lets typical dashboard instruments display accurate oil pressure indications.

• Measurement range: up to 80 psi suitable for most marine engine oil systems
• Electrical: 0–300 ohms resistance output for gauge compatibility
• Mechanical: 1/8"-27 NPT thread ensures a sealed fit when tightened correctly
• Mounting: 10-32 stud terminal for dependable signal wiring connection

How do I install it and what should I watch for during replacement?

Installation is typically straightforward for anyone comfortable with basic engine maintenance. Always depressurize the oil system, clean the mounting port, and use appropriate thread sealant to prevent leaks. Tighten to factory torque specs and check the gauge function after power-up.

• Shut off engine and relieve oil pressure before removal
• Clean threads and use compatible thread sealant or tape
• Connect the 10-32 stud wire securely and test the gauge at key-on
• Inspect for leaks and re-check electrical connections after a test run

Who this is for: Boat owners, marine mechanics and service shops seeking a reliable, economical replacement sender for Mercury/Mercruiser, Volvo Penta or OMC engines. If you need a compatible, easy-to-install unit that replaces a range of OEM part numbers (including 815425T, 3857532, 8M0068784 and others) and works with common V6 and V8 marine blocks, this DUZFOREI oil pressure sender is designed to meet that need. Always confirm part numbers and thread/terminal fit before purchase to ensure correct match for your vessel.