Gauges

Factory dashboards provide basic information, but they are often limited. Many warning lights only activate once a system is already outside safe limits. Adding the right gauge gives you real-time data, allowing you to spot trends before they turn into problems.

If you tow, run performance modifications, use electrical accessories, or simply want a clearer picture of what is happening under the bonnet, aftermarket gauges can be a worthwhile addition. The key is choosing gauges that serve a real purpose rather than adding clutter.

What Aftermarket Gauges Are Useful in Your Vehicle?

The most useful gauge depends on how you use your vehicle. A standard daily setup may only benefit from one or two additions, while a turbocharged or heavily accessorised build may justify several.

Common choices include:

• Oil pressure gauge
• Boost gauge
• Water temperature gauge
• Oil temp gauge
• Voltmeter or voltage meter
• Fuel pressure gauge
• EGT gauge
• Air fuel ratio gauge
• Hour meter

An oil pressure gauge, whether a digital oil pressure gauge, mechanical oil pressure gauge, or complete oil pressure gauge kit, gives constant feedback on engine lubrication. Options such as a SAAS oil pressure gauge or autometer oil pressure gauge are commonly fitted for this reason.

If you are running forced induction, a boost gauge becomes important. Products like a Redarc boost gauge, VDO boost gauge, or combined Redarc boost EGT gauge allow you to monitor turbo performance and exhaust temperatures together.

Cooling system monitoring is equally important. A water temp gauge or electronic temperature gauge provides clearer information than many factory clusters. Popular choices include a VDO water temp gauge, SAAS water temp gauge, or VDO temp gauge paired with a SAAS water temp sensor.

Fuel system monitoring can also be useful. An aftermarket fuel gauge or fuel pressure gauge confirms consistent delivery. In performance applications, an afr gauge, also known as an air fuel ratio gauge, helps verify safe mixtures under load.

How Easy Is It to Connect an Aftermarket Gauge?

Installation varies depending on the type of gauge. A voltmeter or voltage meter is typically the simplest. It usually requires an ignition-switched power source, an earth connection, and illumination wiring.

An oil pressure gauge installation is more involved. A mechanical oil pressure gauge uses a physical line from the engine to the gauge, which must be routed carefully to avoid leaks. A digital oil pressure gauge uses an electronic sender mounted to the engine block, simplifying cabin installation but still requiring proper sealing.

Boost gauges connect to a boost reference line from the intake manifold. An EGT gauge requires fitting a probe into the exhaust manifold, which demands accuracy and care.

Take your time, use quality fittings, and secure wiring away from heat and moving parts. Rushing the job often creates problems later.

Why Is an Aftermarket Oil Pressure Gauge Helpful?

Oil pressure is one of the most critical measurements in any engine. Factory systems often rely on a simple warning light. By the time that light activates, pressure may already be dangerously low.

An oil gauge provides constant feedback. You can observe:

• Cold start pressure levels
• Idle pressure once warm
• Pressure changes under load
• Sudden drops during hard driving

If you notice gradual changes over time, it can indicate bearing wear, oil pump issues, or oil thinning. Catching these signs early can prevent major engine damage.

Do You Need a Voltmeter in Your Vehicle?

A voltmeter is simple, but useful. It shows charging system performance in real time.

With the engine off, you would typically expect around 12.6 volts from a healthy battery. With the engine running, alternator output generally sits between 13.5 and 14.5 volts.

If voltage drops below normal while driving, it may point to alternator wear, battery deterioration, or wiring faults. If you run accessories such as fridges, winches, lighting, or audio systems, a volt meter helps you avoid draining the battery unexpectedly.

Where Are Good Places to Mount Aftermarket Gauges?

Placement matters. Gauges need to be visible, but not distracting.

Common mounting locations include:

• A-pillar pods
• Dashboard top mounts
• Centre console panels
• Under-dash brackets
• Custom panels using a 52mm gauge holder

Keep wiring tidy, protect it with proper sleeving, and secure gauges firmly to reduce vibration. Grouping related gauges together, such as a boost gauge, EGT gauge, and afr gauge, makes monitoring easier under load.

If you are planning a gauge installation, it also makes sense to consider complementary upgrades such as wiring accessories and connectors, switch panels and mounting brackets, and engine sensors and senders. Pairing quality gauges with proper installation hardware ensures reliable readings and a tidy finish.