Mercury – Water Pressure Kit | Gauge Installation Hardware | 8M0059531

Overview
This kit gives you the engine-side parts you need to run an analog water-pressure gauge on a Mercury 150 FourStroke. It taps into the motor’s pressure port and sends a clean signal up to the gauge, so you can actually see what the cooling system is doing. Out on the water, it helps the gauge stay steady instead of bouncing or dropping out. It’s a simple, practical kit made specifically for this engine.

Key Features
    • Engine-Side Hardware – Supplies the fittings needed to hook a gauge to the motor.
    • Steady Pressure Feed – Gives the gauge a clean, reliable signal.
    • OEM Threading – Fits Mercury’s 150 FourStroke pressure port properly.
    • Marine-Ready Components – Built to handle heat, spray, and vibration.
    • Gauge-Compatible – Works with standard Mercury pressure tubing.

Engine & Boat Compatibility
    • Mercury 150 FourStroke
    • Mechanical setups
    • Analog water-pressure gauge systems
    • Console or dash gauge installs

Performance & Practical Benefits
Once installed, this kit helps the gauge read the way it’s supposed to. You get a smoother signal, fewer dead spots, and a better sense of how well the engine is pulling water. It’s especially helpful for spotting things like clogged intakes or low flow before they turn into real problems. Easy to install, easy to live with.

Why Buy OEM
OEM fittings seal right, thread right, and last longer than the generic stuff. They’re built for the exact port on the 150 FourStroke, so you’re not dealing with leaks or mismatched threads. Most boaters stick with OEM because accuracy matters when you’re watching cooling pressure.

FAQ
1. How do I know this is the kit I need?
If you’re adding an analog water-pressure gauge to a Mercury 150 FourStroke, this is the correct engine-side kit.

2. Does it come with tubing?
No—this set gives you the fittings. The tubing is separate.

3. Do I need thread sealant?
A little marine-safe sealant helps, as long as it follows Mercury’s recommendations.

4. Is the install tough?
Not really—find the port, thread the fitting in, hook up your tubing, and route it cleanly.

5. What if the gauge still reads low?
Double-check for small leaks or a clogged pickup or engine port.