Description
The Speedhut 2-5/8″ 100-500F Cylinder Head Temp w/ Warning (R25-CT1-REV) is a vital instrument for monitoring the thermal health of your engine’s cylinder head. This gauge provides accurate readings within the 100-500°F range, allowing you to observe temperature fluctuations and identify potential overheating issues before they lead to significant damage. Equipped with a user-configurable warning light, this gauge offers an immediate visual alert if temperatures exceed a preset threshold, enabling prompt action to safeguard your engine. The included K-type thermocouple probe ensures reliable temperature sensing directly from the cylinder head. Designed for easy installation, this 2-5/8″ (66mm) gauge fits standard mounting holes and comes with all the necessary components to get you up and running quickly.
KEY FEATURES AND BENEFITS:
- Accurate Temperature Monitoring: Provides precise readings of your engine’s cylinder head temperature within the 100-500°F range, crucial for maintaining optimal engine performance and longevity.
- Early Overheat Detection: Features a built-in warning light that illuminates when cylinder head temperatures rise above a user-defined limit, providing an immediate visual cue to potential problems.
- Reliable Sensor Technology: Utilizes a K-type thermocouple probe, known for its wide temperature range and dependable performance in demanding automotive environments.
- Straightforward Installation: The 2-5/8″ gauge size fits common mounting locations, and the included power and lighting harness simplifies the wiring process.
- Durable and Long-Lasting: The 9-foot long K-type probe features a braided steel line, offering enhanced protection and durability in the engine bay.
- Complete Installation Kit: Ships with all essential components, including the gauge, temperature probe, and wiring harness, ensuring a hassle-free setup.
SPECIFICATIONS:
- Gauge Type: Temperature Gauge
- Gauge Subtype: Cylinder Head Temperature Gauge
- Temperature Range: 100-500 °F
- Size: 2 5/8 inch (66mm)
- Hole Size: 2.67 inches (68mm)
- Sender Type: K Type Thermocouple Temp Probe
- Warning Light: Yes
- Included: 3 ft Power & Lighting Harness, Cylinder Head (14mm) Type K Probe 9′ long with Braided Steel Line, Gauge Mounting Ring
HOW TO USE:
- Mount the Gauge: Locate a suitable 2.67″ (68mm) diameter hole in your dashboard or mounting panel. Insert the Speedhut gauge into the hole and secure it using the included mounting ring from the back.
- Install the Temperature Probe: Identify a 14mm threaded port on your engine’s cylinder head (often a spark plug location). Carefully remove the existing component and install the K-type thermocouple probe. Ensure the probe is securely tightened according to the manufacturer’s instructions.
- Connect the Wiring Harness: Connect the 3 ft Power & Lighting Harness to the back of the Speedhut gauge.
- Connect Power and Ground: Connect the power wire (typically red) from the harness to a switched 12V power source in your vehicle. Connect the ground wire (typically black) to a reliable ground point on your vehicle’s chassis.
- Connect Lighting (Optional): If desired, connect the lighting wire (often orange or a similar color) to your vehicle’s lighting circuit so the gauge backlighting illuminates with your other instruments.
- Set the Warning Temperature (If Applicable): Some Speedhut gauges allow you to set a specific temperature threshold for the warning light. Refer to the gauge’s specific instructions on how to program this setting.
- Verify Operation: Once all connections are made, start your vehicle and observe the gauge readings. Ensure the warning light functions correctly by allowing the engine to warm up or by simulating an over-temperature condition (if possible and safe to do so for testing purposes).
BENEFITS OF USING THE SPEEDHUT 2-5/8″ 100-500F CYLINDER HEAD TEMP W/ WARNING (R25-CT1-REV):
- Proactive Monitoring: Provides crucial insights into your engine’s thermal state, allowing you to identify potential issues such as cooling system malfunctions or improper ignition timing before they escalate.
- Early Overheat Detection: The integrated warning light alerts you to overheating, giving you valuable time to take corrective action and prevent engine damage.
- Optimized Engine Performance: Accurate temperature readings allow for better engine tuning and performance adjustments, contributing to improved vehicle efficiency and longevity.
- Enhanced Engine Longevity: By preventing overheating, this gauge helps extend the life of your engine, reducing the risk of costly repairs and maintaining reliable performance.
FEATURES:
- Real-time Temperature Display: Continuously shows the current cylinder head temperature in Fahrenheit for immediate monitoring.
- Adjustable Warning Threshold: Allows users to set a specific temperature limit that triggers the integrated warning light.
- K-Type Thermocouple Compatibility: Designed specifically for use with reliable and accurate K-type thermocouple probes.
- Standard 2-5/8″ (66mm) Size: Fits seamlessly into common aftermarket gauge mounting solutions.
- Included Mounting Hardware: Comes with a mounting ring for secure and clean installation.
- Braided Steel Probe Line: Offers enhanced durability and protection for the temperature sensor wiring in harsh engine environments.
- Dedicated Wiring Harness: Simplifies the electrical connections for power, ground, and lighting.






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