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Product # 8549

  • 2-1/16" (52.4mm)
  • Air-Core Air-Core
  • 100-250 °F
  • LED
  • Download
  • Ships in 5 Business Days
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Transmission fluid temperature is the single biggest contributing factor to the lifespan of your automatic transmission. Having an accurate, realtime measurement allows you to know when to downshift or when to take your foot out of it. Whether you’re towing or simply trying to harness the power of a built or boosted motor, AutoMeter’s Trans Temp Gauge will give you the most accurate possible measurement for the exact temp of your trans fluid. A single wire 1/8” NPT temperature sender included to be installed in your transmission, transmission pan or with an optional transmission cooler line manifold is available for easy installation into a transmission cooler hard line.

Feature Points

  • Factory matched LED through-the-dial lighting provides clear visibility during nighttime use and matches OEM instrumentation
  • 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system
  • Gauge kit includes 1/8” NPT temperature sender, 3/8” and 1/2" NPT adapters, mounting hardware, and detailed instructions for installation
  • AutoMeter’s race proven air-core electric instruments provide quick and accurate readings while keeping hazardous fluids outside of the vehicle

Sending Units

  • 2258


  • 3/8" NPT and 1/2" NPT adapter fittings

Mounting Hardware

  • 2230
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Does this gauge have a plug on the back for the wiring ?

Asked by: Dzeeks
Thank you for your question. This gauge will have three terminals on the back for wiring, a 12v terminal, a ground terminal, and a signal terminal.
Answered by: Zach from AutoMeter
Date published: 2018-11-26

My factory Jeep gauge is identical to this except the my bezel is chrome. Can I get this changed on the gauges that I order?

Asked by: BajaBoy
Thank you for your question. Yes, you could order this gauge series with a chrome bezel. You will have to call our customer service department at 866.248.6356 and place a special order. Please note, there is typically an additionally fee for special orders.
Answered by: Zach from AutoMeter
Date published: 2018-11-02

Hello, do you have any vehicle specific instructions for wiring this gauge so it dims with the factory gauge cluster?

Asked by: The Other Byron
Thank you for the question. It would depend on the vehicle make, model, and year. If these are going into a Gen 3 Dodge Ram, we do have some information in our 2008 6.7 liter installation guide here: https://www.autometer.com/resources/index/guide_view/id/7 However, since the gauge is LED lighted and if it's being used in conjunction with other factory instruments, you may have to consider using our 9114 Dimmer Module. Otherwise, if you dim the AutoMeter gauge to an acceptable nighttime level, it may darken the factory gauges too much.
Answered by: Matt from AutoMeter
Date published: 2018-07-17

Is there a similar guage available for diff temp? If not can it be custom made? Or the same as trans temp, but say diff temp? Looking to monitor the rear diff temp and my g56 manual transmission.

Asked by: Bare Metal Fab
Thank you so much for contacting us. We do not presently offer a diff temp gauge in this series, and due to the dial construction, it would be prohibitively expensive to build a custom one. You can absolutely use this gauge as a diff temp gauge as there is no difference in the internals or sending unit, it just won't be labelled as such. Sorry for the bad news.
Answered by: Joseph At AutoMeter
Date published: 2018-07-15

Is it possible to change the color of the light in this gauge (Trans Temp #8549), to a different color?

Asked by: Dred's Dodge
Thank you so much for contacting us. Unfortunately the Factory Match gauges have a fixed lighting configuration. The color stems from a treatment on the dial itself that will always tint the lighting color that same shade of green. Sorry for the bad news.
Answered by: Joseph At AutoMeter
Date published: 2018-01-15
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