Taukealugs Oil Pressure Sender Sensor for MerCruiser & Volvo Penta — 1/8"-27 NPT, 0–80 psi

High-accuracy Taukealugs oil pressure sender sensor replaces 815425T, 3857532, 18-5899 and compatible units for MerCruiser and Volvo Penta engines. This aftermarket oil pressure sending unit is engineered to provide a direct, drop-in alternative for multiple OEM part numbers used across MerCruiser, OMC, Crusader and Volvo Penta marine engines. It matches the common 1/8"-27 NPT thread and 10-32 stud terminal, reads up to 80 psi with a 0–300 ohm resistance curve, and is intended for gauge systems that need a reliable electrical pressure signal.

Will this sensor fit my engine and replace my existing part number?

The Taukealugs sender is built to replace a broad set of OEM references so it suits many MerCruiser 4-cylinder, V6 and V8 installations as well as OMC/Volvo units. Verify thread, terminal and gauge requirements before ordering to ensure mechanical and electrical compatibility.

• Compatible OEM numbers: Mercury/MerCruiser 815425T, 8M0068784
• Also replaces: OMC/Volvo Penta 3857532, 3853800, 0982650, 18-5899
• Thread: 1/8"-27 NPT; Terminal: 10-32 stud; Range: 0–80 psi output
• Resistance characteristic: 0–300 ohms for common marine gauges

How do I install this pressure sender on my boat?

Installation is typically straightforward: shut off the engine, relieve system pressure, remove the old sender, apply sealant or thread tape to the new unit's 1/8"-27 NPT threads, then hand-tighten and finish with a wrench. Reconnect the gauge wire to the 10-32 stud terminal and test for proper reading and leaks.

• Tools: wrench, thread sealant or PTFE tape, basic hand tools
• Safety: disconnect battery and allow engine to cool before starting
• Test: start engine briefly and verify gauge response and no leaks

What electrical and pressure specifications should I expect?

This aftermarket sender follows the common marine sender curve so most factory and aftermarket gauges will read correctly. It supplies a resistance signal from about 0 to 300 ohms across a working pressure range up to 80 psi, using a 10-32 stud electrical terminal for the gauge connection.

• Pressure range: up to 80 psi suitable for marine oil systems
• Resistance output: approximately 0–300 ohms across the range
• Terminal: 10-32 stud compatible with standard ring or spade connectors

How can I tell if my oil pressure sender is failing?

Common signs include an erratic or stuck gauge, false low or high readings, or oil leaks at the sender body. Before replacing, check wiring, grounding, and gauge functionality to rule out electrical causes.

• Symptoms: fluctuating, pegged, or zero readings on the oil gauge
• Checks: verify solid ground, clean terminal, and continuity with a multimeter
• Replacement: choose compatible thread and electrical type to avoid mismatch

Who is this for? This Taukealugs oil pressure sender is designed for boat owners, marine mechanics, and DIY enthusiasts who need a reliable, compatible replacement for worn or damaged oil pressure senders on MerCruiser, OMC, Crusader and Volvo Penta engines. It suits anyone looking for a budget-friendly aftermarket option that matches common thread, terminal and resistance specifications so the original oil gauge continues to function accurately without rewiring or gauge modification.

FAQ

Q: Does this sender work with MerCruiser 815425T?

A: Yes — it is designed to replace MerCruiser 815425T and several equivalent OEM numbers with matching thread and terminal.

Q: What thread and terminal does the sender use?

A: It uses a 1/8"-27 NPT thread and a 10-32 stud terminal, with a 0–300 ohm resistance curve up to 80 psi.