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2-1/16" GM CAN-Bus Transmission Temperature Gauge | 60–150°C Metric with Warning

SKU: GFR1-113
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$145.95 USD
Reads transmission temperature data directly from supported 2008+ U.S.A. GM ECUs through the OBDII CAN-Bus network. Built-in warning light adds a clear visual alert when transmission temperature reaches the set threshold. Precision stepper motor movement keeps readings smooth, stable, and accurate.
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Order leaves our facility in about 2 Weeks

The GM CAN-Bus Transmission Temperature Gauge with Warning Light reads trans temp data directly from the vehicle’s ECU through the OBDII CAN-Bus network, giving you a clean 60–150°C metric temperature range without adding an external sender when supported by the ECU. Built for 2008 or newer U.S.A. GM vehicles, it is designed for cleaner wiring, faster setup, and reliable transmission temperature monitoring from the data your vehicle already provides. The integrated warning light adds a clear visual alert when transmission temperature reaches the set threshold, while a microprocessor-driven movement and high-torque stepper motor keep the pointer smooth, stable, and accurate. Finished with a slim case, spin-lock mounting, solid aluminum bezel, and weather-resistant build, it is made in the USA and backed for life.

Track-Tested. USA-Built. Backed for Life.

Key Features

  • GM CAN-Bus Integration: Reads transmission temperature data through the OBDII CAN-Bus network on supported GM vehicles.
  • Built-In Warning Light: Adds a clear visual alert when transmission temperature reaches the set threshold.
  • 2008+ GM Vehicle Support: Configured for supported U.S.A. GM vehicles with compatible ECU data output.
  • No External Sensor Required — eliminates added sensor wiring when supported by the ECU
  • Clean Wiring Setup: Receives data through OBDII wiring for a simpler, less cluttered install.
  • Microprocessor-Driven Accuracy: Internal electronics help maintain real-time reading precision.
  • Stepper Motor Precision: High-torque stepper motor delivers smooth, stable pointer movement.
  • Weather-Resistant Build: Solid aluminum bezel and durable construction built for street, track, and custom applications.
  • Made in the USA — backed by a lifetime warranty
Important OBD2 CAN-Bus Notes
  • Supported Data Required — vehicle must output CAN temperature data through the OBD2 port
  • Dedicated OBD2 Connection — no other devices can share the port
  • Data Only Through OBD2 — separate power and lighting wiring required
  • No Analog Input Support — not compatible with analog senders or raw signals
  • IPX6-Rated Protection — sealed against heavy spray; not for submersion
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Built to last. Backed for life.
  • Lifetime warranty on internal circuit board electronics
  • 5-year coverage on sensors and wiring
  • Applies to gauges purchased since Jan. 1, 2006

Every Speedhut gauge includes a lifetime warranty* on the electronic circuit board inside the gauge case. It is the core of the gauge — the part responsible for the precision communication that delivers the accuracy and performance Speedhut is known for.

Sensors, wiring, and other external components are covered by an unlimited 5-year warranty.

This combined lifetime / 5-year warranty applies to the original purchaser.
*For your lifetime — as long as you own the gauge — we stand behind it.
Speedhut Inc warrants products to be free from defects in materials or workmanship. This warranty is limited to repair or replacement. Speedhut Inc is not responsible for incidental or consequential damages. Improper use, installation, or unauthorized modifications void this warranty.

If the threads are wrong, you will need an adapter that changes your port to 1/8" NPT. We have some available, ensure you verify it is the right one.

If the sensor fits the threads but is too long, you can try trimming it up to but NOT past the notch. Trimming past the notch will damage the sensor. If it still does not fit, you can get a radiator hose adapter with a 1/8" NPT port.

If you have just installed the gauge, ensure you are using the sensor provided as other sensors will not work. 

If the gauge does not sweep on startup, it is not getting power. Verify the red, white, black power harness is connected properly.

If it sweeps but is not reading at all, ensure the signal harness is connected and pressed in firmly on both sides.

If it's still not working, test the signal harness for continuity with a multimeter. If you have both probes on the metal terminal and it reads "OL" or 0 ohms, the harness is bad.  Call or email us to get a replacement harness. You can put paperclips in the harness connector if needed to get a good contact point.

If the harness is testing good, the next step is to measure ohms coming from the sensor while it is warm. Refer to the chart below, if the ohm reading is close to 0 or it's an OL, you need a new sensor. We recommend reading the ohms at the gauge side to verify it is getting to the gauge.

Temp Sensor Resistance Chart
Temp CTemp FResistance
(Ohms)
60140238
65.55150199
71.11160168
76.66170144
82.22180125
87.77190108
93.3320094
98.8821082
104.4422071
11023061
115.5524051
121.1125043
126.6626036

The sender and gauge must be grounded to the same source to operate correctly.

The sender's ground path is its mounting threads. Ensure that what the sender is threaded into is grounded to the same source as the gauge.

Use Teflon paste on the sender threads to secure the seal and maintain a secure ground connection. Teflon tape will NOT assist the ground connection.

Making a comparison to a Temperature Gun reading should be used as a basic comparison only. A temperature gun only measures surface temperature, and does not measure internal temperature. Surface temperature will always be cooler than the coolant inside the engine. A common temperature difference would be between 5 and 25 degrees, between the water temperature gauge and a temperature gun. This depends on the efficiency of the component being shot with the temperature gun to dissipate heat. So, if your gauge reads 195 and you point & shoot and get a reading of 185, you can safely assume that you are seeing a reasonable, and realistic comparison. Only use a temperature gun to make basic temperature comparisons. Understand, that when everything is working correctly, the gauge will usually read higher since the gauge measures core temperature, and the temperature gun measures surface temperature.

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