Monitoring exhaust gas temperature (EGT) is critical for diesel truck owners who tow, haul, or tune their engines. Excessive heat can damage pistons, turbochargers, and valves. We researched manufacturer specifications, industry standards, and aggregated owner feedback to compare the top EGT gauges on the market. This guide covers analog and digital options, probe types, and display features to help you choose the right gauge for your truck.
| Photo | Product | Score | Buy |
|---|---|---|---|
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AutoMeter 4338 Ultra-Lite II Exhaust Gas Temperature Gauge Best Overall 2-1/16" diameter, 0-1600°F range, electric stepper motor, includes thermocouple probe |
9.0 | 🛒 Check Price |
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Isspro EV2 Series Exhaust Gas Temperature Gauge Best Analog 2-1/16" diameter, 0-1600°F range, air-core movement, includes thermocouple and wiring kit |
8.7 | 🛒 Check Price |
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GlowShift Elite 10 Color Digital EGT Gauge Best Digital 2-1/16" diameter, 0-2000°F range, digital LED display, 10 color options, peak recall |
8.4 | 🛒 Check Price |
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Edge Products Insight CTS2 EGT Monitor Best Multi-Function Dashboard-mounted display, 0-2000°F EGT, touchscreen, reads multiple PIDs |
8.1 | 🛒 Check Price |
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VDO 310-101 Exhaust Gas Temperature Gauge Best Budget 2-1/16" diameter, 0-1200°F range, analog, includes sender and wiring |
7.8 | 🛒 Check Price |
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AEM Electronics 30-4900 Digital EGT Gauge Best for Tuning 2-1/16" diameter, 0-2000°F range, digital, peak/warning, includes Bosch LSU 4.9 sensor |
8.3 | 🛒 Check Price |
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Equus 6320 Exhaust Gas Temperature Gauge Basic Analog 2" diameter, 0-1600°F range, analog, incandescent lighting, includes probe |
7.3 | 🛒 Check Price |
1. AutoMeter 4338 Ultra-Lite II Exhaust Gas Temperature Gauge: Best Overall
The AutoMeter 4338 Ultra-Lite II is a top choice for diesel truck owners who demand accuracy and durability. In our evaluation of manufacturer specs, the electric stepper motor provides precise needle positioning and is less prone to vibration damage than traditional air-core movements. The 0-1600°F range covers typical EGT levels for both stock and modified trucks. Owner feedback consistently praises its clear white LED backlighting and easy installation.
However, this gauge is one of the more expensive options, and the included thermocouple probe may require a separate bung if your exhaust manifold lacks a pre-tapped port. If you are on a tight budget or need a digital readout, you may want to consider a lower-cost alternative. But for those who prioritize build quality and proven performance, this gauge is a solid investment.
- Accurate stepper motor movement with smooth needle sweep
- Brushed aluminum bezel and white LED lighting for easy reading
- Includes 6-foot thermocouple probe and installation hardware
Pros: High accuracy and reliability from a trusted brand; Classic styling that matches OEM interiors
Cons: Higher price point than some competitors
2. Isspro EV2 Series Exhaust Gas Temperature Gauge: Best Analog
The Isspro EV2 series is a favorite among truck enthusiasts for its analog charm and robust construction. Based on our comparison of specifications, the air-core movement is time-tested and offers good accuracy for most applications. The gauge includes a Type K thermocouple and a pre-terminated wiring harness that simplifies installation. Owner reviews highlight the gauge’s readability and the availability of different bezel styles.
One limitation is that air-core movements can drift slightly under severe vibration or temperature extremes compared to stepper motor gauges. Also, the green backlighting may not match all dash lighting. If you prefer a modern digital display or need the highest precision for tuning, you might look elsewhere. However, for a reliable analog gauge that won’t break the bank, the Isspro EV2 is an excellent choice.
- Industry-standard air-core movement for reliable analog display
- Black face with white numbers and green backlighting (optional)
- Includes a 6-foot Type K thermocouple and complete wiring harness
Pros: Excellent build quality at a moderate price; Wide range of bezel and lighting options for custom builds
Cons: Air-core movement can be less accurate at extreme temperatures
3. GlowShift Elite 10 Color Digital EGT Gauge: Best Digital
The GlowShift Elite 10 Color Digital EGT Gauge offers modern features at a competitive price. In our research, the digital display provides quick, precise readings and the ability to set a warning alert for high EGTs. The 10-color LED options let you match your truck’s interior lighting. Owner feedback often praises the easy setup and the peak recall function that helps monitor maximum temperatures during a drive.
However, some users report that the digital numbers can be washed out in bright sunlight, making them less readable than analog needles. Additionally, the plastic housing feels less premium than metal bezel gauges. If you prefer a classic analog look or need a gauge that is always readable in direct sun, this may not be the best pick. But for tech-savvy users who want a feature-rich digital gauge, it is a great value.
- Large digital readout with 10 selectable LED colors
- Peak temperature recall and programmable warning alert
- Includes Type K thermocouple probe and installation kit
Pros: Highly customizable display color to match any interior; User-friendly programming with peak recall feature
Cons: Digital display can be hard to read in direct sunlight
4. Edge Products Insight CTS2 EGT Monitor: Best Multi-Function
The Edge Products Insight CTS2 is more than just an EGT gauge; it is a comprehensive monitoring system. Based on manufacturer specifications, it can display exhaust temperature, turbo boost, engine RPM, coolant temperature, and more via a color touchscreen. The unit comes pre-loaded with vehicle-specific configurations for many popular diesel trucks, making installation relatively straightforward. Owner reviews highlight the data logging capability for tuning and troubleshooting.
On the downside, the CTS2 is significantly more expensive than a standalone EGT gauge. Some users have reported that the touchscreen can be slow to respond in cold weather, and the included thermocouple may not be as accurate as dedicated racing gauges. If you only need EGT monitoring and want to keep costs low, this is overkill. But for serious truck owners who want a full suite of engine data, it is a powerful tool.
- Color touchscreen displays EGT along with boost, RPM, and more
- Pre-configured for many diesel trucks, plug-and-play with included harness
- Records and graphs data for diagnostic analysis
Pros: All-in-one monitoring solution for multiple engine parameters; Intuitive touchscreen interface with data logging
Cons: Expensive and may require additional sensors for full functionality
5. VDO 310-101 Exhaust Gas Temperature Gauge: Best Budget
The VDO 310-101 is a no-frills analog EGT gauge that gets the job done for basic monitoring. In our evaluation of specs, it offers a 0-1200°F range, which is adequate for stock or lightly modified diesel trucks. Owner feedback indicates it is easy to install and provides consistent readings. The low cost makes it accessible for budget-conscious truck owners who want to keep an eye on exhaust temperatures.
However, the 1200°F maximum is lower than many aftermarket gauges, and it may not be suitable for heavily tuned engines that can exceed 1400°F. Also, the build quality is less robust than premium brands, and the lack of a warning light or peak recall is a drawback. If you are pushing high horsepower or need advanced features, skip this gauge. For basic monitoring on a stock truck, it is a good value.
- Affordable analog gauge for basic EGT monitoring
- Simple design with black face and white numbers
- Includes thermocouple sender and installation hardware
Pros: Very low price point for entry-level monitoring; Easy to install with basic wiring skills
Cons: Limited temperature range (1200°F max) may not suit performance builds
6. AEM Electronics 30-4900 Digital EGT Gauge: Best for Tuning
The AEM 30-4900 Digital EGT Gauge is designed for serious tuners who need precise temperature data. According to manufacturer specs, it offers a 0-2000°F range and a resolution of 0.1°F, making it one of the most accurate gauges we researched. It also has a programmable warning output that can trigger a shift light or data logger. Owner feedback from performance enthusiasts highlights its fast response and reliability during dyno tuning sessions.
The main drawbacks are the price and the complexity if you also integrate the wideband O2 sensor function. The gauge is primarily an EGT monitor, and the wideband capability requires additional wiring and sensor installation. If you are not tuning for maximum power, the extra cost and effort may not be justified. However, for dedicated tuners who demand the best accuracy, this gauge is a top contender.
- High-resolution digital display with 0.1°F increments
- Programmable warning output for external alarms or data loggers
- Includes Bosch wideband oxygen sensor for air-fuel ratio (optional use)
Pros: Very accurate and fast response time; Can be used with wideband O2 sensor for comprehensive tuning
Cons: Higher cost and more complex installation if using wideband feature
7. Equus 6320 Exhaust Gas Temperature Gauge: Basic Analog
The Equus 6320 is an entry-level analog EGT gauge that offers a full 0-1600°F range at a low cost. In our research, it provides the essential function of monitoring exhaust temperature without any extra features. Owner reviews note that it is straightforward to install and gives consistent readings. It is a good option for those who need a basic gauge for peace of mind.
However, the incandescent backlighting is noticeably dimmer than LED-lit gauges, making it harder to read at night. The build quality is also less robust, with a plastic housing that may not hold up as well over time. If you want a gauge that looks great and lasts for years, you might consider spending more. But for a simple, functional EGT gauge that won’t strain your wallet, the Equus 6320 is a reasonable choice.
- Economical analog gauge with 0-1600°F range
- Simple two-wire hookup for quick installation
- Includes thermocouple probe and mounting bracket
Pros: Budget-friendly price for a full-range gauge; Works well for basic monitoring without frills
Cons: Incandescent bulb lighting is dim compared to LED
Frequently Asked Questions
What is a safe exhaust gas temperature for a diesel truck?
Generally, continuous EGTs below 1250°F are considered safe for most diesel engines. Peak temperatures up to 1400°F may be acceptable for short bursts, but sustained temperatures above 1300°F can damage pistons, exhaust valves, and the turbocharger. Always refer to your engine manufacturer’s guidelines and consider your tuning level.
Do I need a pyrometer or an EGT gauge?
They are essentially the same thing. A pyrometer measures high temperatures, and in automotive applications, it is used as an exhaust gas temperature gauge. Both terms are used interchangeably. When shopping, look for a gauge that includes a thermocouple probe and is designed for exhaust gas monitoring.
Where is the best location to install the EGT probe?
The ideal location is in the exhaust manifold, within 6-8 inches of the turbocharger inlet. This gives the most accurate reading of the hottest exhaust gases before they enter the turbo. Installing after the turbo can read 200-300°F lower. Always drill and tap a bung into the manifold or use an existing port if available.
Can I install an EGT gauge myself?
Yes, many truck owners install EGT gauges themselves. The process involves mounting the gauge, routing the thermocouple wire, connecting power and ground, and installing the probe into the exhaust. Basic mechanical and electrical skills are required. If you are not comfortable drilling into your exhaust manifold, consider professional installation.
What is the difference between analog and digital EGT gauges?
Analog gauges use a needle and dial, offering a quick visual reference and are often preferred for their classic look. Digital gauges provide precise numerical readings and may include features like peak recall, warning alerts, and customizable colors. Digital displays can be harder to read in direct sunlight, while analog needles can be affected by vibration. Choose based on your preference and needs.
Our Verdict
After researching and comparing specifications and owner feedback, our top pick is the AutoMeter 4338 Ultra-Lite II for its proven accuracy, durability, and classic design. The runner-up is the Isspro EV2 Series, which offers excellent analog performance at a more accessible price point. Both gauges provide reliable EGT monitoring for diesel truck owners.
