Yonligonju Oil Pressure Tester Kit 0–140 PSI, Red Case with Dual-Display Gauge and 10 Adapters

Whether you're troubleshooting an engine, verifying an oil pump, or confirming pressure after a repair, this kit provides a portable, vehicle-ready way to measure oil pressure on cars, trucks, motorcycles, boats, and small diesel engines. The kit bundles a dual-display analog gauge, oil-resistant hose, brass fittings, and ten adapters inside a red transport case so you can identify problems without guessing.

How do I use the Yonligonju tester to check engine oil pressure?

Start by locating the engine's oil pressure port or removing the oil pressure switch. Select the matching adapter from the red case, attach the brass fitting and hose, then connect the gauge and crank the engine briefly to read pressure. Always follow engine-specific service instructions and take safety precautions when working near a running motor.

• Choose the adapter that matches your vehicle's oil pressure port number in the case.
• Install brass quick fittings for a secure, leak-free connection.
• Run the engine at idle and at specified RPMs to compare readings.
• Use the dual-display gauge to monitor peak and live pressure values.

What does the gauge measure and how accurate is it?

The Yonligonju gauge reads oil pressure from 0 to 140 PSI, giving a wide range suitable for most gasoline and small diesel engines. The clear scale and dual-display design make readings easy while the rubber buffer cover protects the gauge during shop or roadside use. For precise diagnostics, compare readings to manufacturer-recommended pressure ranges for your engine.

• 0–140 PSI range covers common passenger and light truck engines.
• Dual-display face offers quick visual confirmation and repeatable readings.
• Protective rubber cover reduces impact damage during handling.
• Brass fittings and oil-resistant hose maintain a reliable seal under heat.

Which adapters and parts are included, and will they fit my vehicle?

The kit contains ten numbered adapters designed to match most oil pressure ports found on cars, motorcycles, boats, and small diesel engines. Each adapter is made from high-quality metal and stored in a marked slot within the compact red case for quick selection. If your engine's port matches an adapter number and its oil pressure remains under 140 PSI, the kit will work for your application.

• Ten numbered metal adapters to fit a wide variety of engine ports.
• Oil-resistant, heat-resistant hose that bends freely without kinking.
• Straight and elbow brass fittings for faster, reliable connections.
• Organized red case keeps everything secure and easy to find.

How do I care for the tester and prolong its life?

Rinse or wipe the gauge and adapters after exposure to oil or grime and store the components in the protective red case. Avoid dropping the gauge, and keep fittings tightened to prevent contamination. Replace the hose if it shows cracking or leaks, and store in a cool, dry place between uses.

• Clean fittings and hose after each use to prevent buildup.
• Keep the gauge inside the case to shield it from impacts.
• Inspect brass fittings and hose for wear before each test.
• Store out of direct sunlight and extreme temperatures.

Who is this for? The Yonligonju Oil Pressure Tester Kit is built for DIY mechanics, professional technicians, fleet maintenance crews, and hobbyists who need a reliable, portable way to verify engine oil pressure. It’s especially useful when diagnosing oil pump performance, checking pressure after repairs, or performing routine engine health checks on a variety of gasoline and small diesel engines.