Mercury – Oil Pressure Sender, 80 PSI | Instrumentation | 815425

Overview

On a MerCruiser, the oil pressure sender is one of those small parts that can make the whole engine seem like it’s acting up when really the sender’s just tired. A bad one will have your gauge flickering, dropping to zero, or giving readings that don’t match what the engine sounds like. Swapping in this OEM sender brings the gauge back to giving steady, believable numbers so you’re not guessing whether you actually have a pressure issue or just a cranky sensor.

Key Features

 • For 80 PSI Gauges – Made for systems that read up to 80 PSI.
 • Fits Select MerCruiser Engines – Works on a variety of sterndrive and inboard setups.
 • Simple Replacement – Thread it in, hook up the wire, and you’re done.
 • OEM-Accurate Readings – No more bouncing needles or phantom low-pressure warnings.
 • Marine-Built Component – Handles heat, vibration, and the general abuse of a bilge.

Engine & Boat Compatibility

 • MerCruiser sterndrives
 • MerCruiser inboards
 • 80 PSI marine oil pressure gauges
 • Quicksilver / Mercury instrument systems

Performance & Practical Benefits

A good sender makes your oil pressure gauge something you can actually trust again. You’ll see a steady needle at idle, a smooth rise when you throttle up, and fewer “that doesn’t look right…” moments while cruising. It’s one of those simple fixes that gives you more confidence every time you glance down at the dash.

Why Buy OEM

Oil pressure senders look similar across brands, but the internal resistance curve—the part that makes the gauge read correctly—is not universal. OEM senders match Mercury’s gauges perfectly, so you’re not stuck chasing weird readings or early failures from bargain sensors. This part gives you the numbers you’re supposed to see.

FAQ

Q1: How do I know my sender’s going bad?
A: Jumping needle, sudden zero readings, or pressure numbers that don’t line up with how the motor sounds.

Q2: Is this a DIY job?
A: Yep—most folks can swap one out in a few minutes with basic tools.

Q3: Do I need thread sealant?
A: Follow your manual. Some applications need a dab, others don’t.

Q4: Will this fix real low oil pressure?
A: Only if the sender was lying. True low pressure needs actual engine diagnosis.

Q5: Should I stick with OEM gauges?
A: Yes—Mercury senders and gauges are calibrated to work together.

• Supersessions
  34623, 815425T, 8M0068784, 8M0068784, 90806, 90806A1