100–300°F Measurement Range

The gauge monitors temperatures from 100°F to 300°F, covering engine warmup, typical operating temperatures and severe overheating conditions.

The broad range makes it useful for:

• Daily-driven cars
• Performance vehicles
• Pickup trucks
• Engine swaps
• Custom cooling systems
• Towing applications
• Track and autocross builds
• Vehicles with unreliable factory gauges

Normal coolant temperature varies by engine, thermostat, cooling-system pressure and operating conditions. Compare the reading with the vehicle manufacturer’s specifications.

270-Degree Analog Sweep

The illuminated red needle travels across a wide 270-degree sweep, providing more display resolution than a basic short-sweep gauge.

A wider sweep makes smaller temperature changes easier to recognize without requiring the driver to stare at a rapidly changing number. The gauge still cannot physically stop someone from driving while steam pours from the hood. Personal responsibility stubbornly remains part of the system.

Stepper-Motor Movement

GlowShift uses stepper-motor technology to produce smooth, controlled needle movement across the gauge face.

The electronic motor responds to the included sender signal and positions the needle according to measured coolant temperature. This combines the quick-glance readability of an analog gauge with an electronic sender and wiring harness.

Seven Solid LED Colors

Use the button on the front of the gauge to select one of seven solid backlighting colors:

• Blue
• Green
• Red
• Teal
• Yellow
• Purple
• White

The available colors allow the gauge to match many factory instrument clusters or complement other aftermarket gauges.

Two Color-Cycle Modes

In addition to the seven solid colors, the gauge provides two automatic color-cycle modes.

These modes move through the available backlighting colors for use in show vehicles or custom interiors. A solid color is generally less distracting during normal driving, but the dashboard can still audition for nightclub duty when parked.

Color Memory

The gauge stores the selected color setting so it does not need to be reconfigured every time the vehicle is started.

Color memory is especially useful when the gauge is matched to factory dashboard illumination or installed as part of a coordinated multi-gauge layout.

Automatic Nighttime Dimming

Connect the orange dimmer wire to the factory headlight-switch circuit and the gauge will reduce its brightness by approximately 30 percent whenever the headlights are on.

This helps limit glare during nighttime driving while keeping the dial markings and illuminated red needle visible.

Black Dial and Clear Magnified Lens

The Black 7 Color Series features:

• Black gauge face
• Clear magnified lens
• Illuminated red needle
• Matte-black trim ring
• Aluminum housing
• LED through-dial lighting

The clear lens maintains visibility when the gauge is powered off, unlike deeply tinted designs that may hide the dial until illumination is active.

Compact 2-1/16-Inch Housing

The gauge measures 2-1/16 inches, or 52mm, making it compatible with many universal:

• A-pillar gauge pods
• Dashboard pods
• Under-dash panels
• Custom instrument clusters
• In-dash 52mm openings

The included visor can reduce reflections when the gauge is mounted on top of the dashboard or in another brightly lit location.

Electronic 1/8-27 NPT Sender

The kit includes a compact electronic temperature sender with 1/8-27 NPT male threads and bullet-style electrical connectors.

Possible installation locations include:

• Factory coolant-sender port
• Cylinder-head coolant passage
• Intake-manifold coolant port
• Thermostat housing
• Coolant outlet
• Inline radiator-hose adapter

Not every vehicle uses a 1/8-27 NPT port. A thread adapter or hose-mounted sender adapter may be required.

Product Specifications

• Brand: GlowShift
• Product series: Black 7 Color Series
• Manufacturer part number: GS-C706
• UPC: 842559101339
• Gauge type: Electronic water-temperature gauge
• Display type: Analog
• Temperature range: 100–300°F
• Gauge diameter: 2-1/16 inches / 52mm
• Needle sweep: 270 degrees
• Movement: Electronic stepper motor
• Face color: Black
• Needle color: Illuminated red
• Lens: Clear and magnified
• Trim ring: Matte black
• Housing: Aluminum
• Solid backlight colors: Seven
• Automatic color modes: Two
• Color memory: Yes
• Nighttime dimming: Approximately 30%
• Sending unit: Electronic
• Sender thread: 1/8-27 NPT
• Harness length: Two feet
• Measurement unit: Fahrenheit

These specifications were verified against the current GlowShift Black 7 Color product page.

What’s Included

• GlowShift Black 7 Color water-temperature gauge
• 1/8-27 NPT electronic coolant-temperature sender
• Two-foot sensor and power harness
• Gauge visor
• U-shaped metal mounting bracket
• Mounting-bracket hardware
• Step-by-step installation instructions

A vehicle-specific thread adapter, radiator-hose adapter, gauge pod or additional wiring may be required.

Why Install an Aftermarket Temperature Gauge?

Many factory temperature gauges are designed to provide only a general indication of engine temperature. Some remain near the center of the display across a broad operating range, then move toward hot only after the cooling system is already struggling.

An aftermarket coolant gauge can help you:

• Identify abnormal temperature increases
• Monitor coolant temperature under load
• Verify electric cooling-fan operation
• Evaluate radiator and thermostat changes
• Monitor an engine swap
• Replace an inaccurate factory gauge
• Diagnose intermittent overheating
• Track cooling performance in traffic

If rising temperature appears alongside coolant loss, corrosion or visible leakage, review our guide to the seven signs of a failing radiator.

Installation Notes

Install the included sender in a compatible coolant passage where it can contact circulating engine coolant.

GlowShift supports several common installation methods:

• Install in an available coolant-fluid port
• Replace a compatible factory sender
• Add a threaded temperature adapter
• Install an inline radiator-hose adapter

Whenever practical, retain the factory coolant-temperature sensor. The ECU may use it for fuel control, ignition timing, cooling-fan operation and dashboard warnings.

Before installation:

• Allow the engine to cool completely.
• Disconnect the negative battery terminal.
• Verify the coolant-port thread size.
• Install the appropriate adapter when required.
• Route the signal wire through a protected firewall grommet.
• Keep wiring away from exhaust components.
• Avoid belts, pulleys and cooling fans.
• Connect the orange wire to the headlight circuit for dimming.
• Bleed trapped air from the cooling system.
• Inspect the sender and adapter for leaks.
• Test gauge operation before driving.

Use thread sealant according to the included instructions. Excessive sealant can interfere with grounding or contaminate the cooling system.

For more information about coolant senders, read our guide explaining how an engine coolant temperature sensor works.

Frequently Asked Questions

What temperature range does the gauge display?

The GlowShift Black 7 Color gauge displays coolant temperature from 100°F to 300°F.

Is this an analog or digital gauge?

It uses an analog needle display powered by electronic stepper-motor movement.

How many colors are available?

The gauge offers seven solid colors: blue, green, red, teal, yellow, purple and white.

Does it remember the selected color?

Yes. The color-memory feature retains the selected backlighting mode between startups.

Does the gauge dim at night?

Yes. Connecting the orange wire to the factory headlight-switch circuit reduces brightness by approximately 30 percent when the headlights are on.

Is the temperature sender included?

Yes. The kit includes a matched electronic sender with 1/8-27 NPT male threads.

Will the sender fit every vehicle?

No. Coolant-port threads vary by engine. A thread adapter or inline radiator-hose adapter may be required.

Can I use the factory sender?

Use the included sender unless GlowShift confirms compatibility with another sending unit. Different senders may use different electrical resistance curves.

Does this gauge have peak recall?

No peak-recall feature is specified for the Black 7 Color Series gauge.

Does it include a programmable temperature warning?

No programmable warning function is specified. The driver must monitor the analog needle.

What is the difference between this and the 10 Color Digital model?

This gauge uses a 270-degree analog needle, clear lens and seven solid colors. The 10 Color Digital model uses a numerical LED display, tinted lens and ten solid colors.

What should I do if the needle moves toward 300°F?

Reduce engine load and pull over safely if the temperature continues rising. Shut the engine off if coolant escapes, steam appears or another temperature warning activates. Never open a hot radiator cap.

Our guide on how to deal with an overheating engine explains the next diagnostic steps.

GlowShift Warranty and Support

GlowShift backs the gauge with:

• One-year limited warranty
• Free lifetime technical support
• 30-day no-hassle return policy

Warranty and return coverage remain subject to GlowShift’s current terms and installation requirements.

Analog Readability With Custom Lighting

The GlowShift Black 7 Color Water Temperature Gauge combines a wide 270-degree analog sweep with smooth stepper-motor movement, seven solid illumination colors and an included electronic sender.

Its 100–300°F range, clear magnified lens, color memory and nighttime dimming make it a strong choice for enthusiasts who want useful temperature monitoring without giving up the look of an analog gauge.