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AEM’s 40-148C Transmission Temperature Gauge unites unsurpassed accuracy, speed and control with an easy to read, analog interface. The AEM analog gauge also offer a 0-5v analog output for use with data loggers and virtually any engine management system, such as the AEM EMS or FIC.  

The 40-148C Transmission Temperature Gauge is for anyone who wants to know exactly what the temperature of their transmission fluid is during high load conditions. Transmissions and differentials can heat up quickly during race conditions for cars or when towing in trucks. Some transmissions can cost more then the engine, and the temperature is rarely monitored on the factory gauges. The 320 degrees of resolution makes it easy to see when there's even a 2 degree change in temperature, giving you time to shut things down before damage occurs. The lightning fast needle movement is a result of a precision high speed electronic stepper motor making it one of the fastest and most accurate gauges available. A high quality brass sensor gives the gauge its accuracy. The backlighting is user adjustable to 7 colors, allowing users to easily match the Transmission Temperature gauge to most factory gauge clusters. Each gauge comes with interchangeable black & silver bezels and black and white gauge faceplates for multiple color combinations.



  • Gauge Readout from 40 to 148C
  • Adjustable backlighting via a dial on the back of the gauge
  • Includes black and silver interchangeable bezels and white and black faceplates
  • 320 degree viewing area for unsurpassed resolution
  • Temperature gauge includes high quality sensor - everything you need to install the gauge!
  • 0-5v analog output included for use with data loggers and virtually any engine management system


  • Part #: AEM 30-5140M
  • Gauge Backlight Color: 7 Color User Adjustable
  • Gauge Face Color : Black/White
  • Gauge Needle Color: Red
  • Gauge Range: 40 - 148°c
  • Gauge Sending Unit: Electrical
  • Gauge Size (mm): 52mm
  • Gauge Type: Temperature
  • Requires Control Unit: No
  • Sensor Thread Pitch: 1/8 NPT w/ Adapters
  • Units: Metric


  • 1x 35-5140 Temperature Gauge Assembly
  • 1x 35-2012 Temperature Sensor
  • 1x 35-4302 Install Kit (6 Butt Connectors)
  • 1x 10-5140 Installation Instructions
  • 1x 35-3411 8-Pin Power Harness
  • 1x 35-3413 3-Pin Sensor Harness
  • 1x 35-8529S Silver Bezel
  • 1x 35-8539W Trans Temp Faceplate, White
  • 1x 35-8539B Trans Temp Faceplate, Black
  • 1x 35-8541W Oil Temp Faceplate, White
  • 1x 35-8542W Coolant Temp Faceplate, White
  • 1x 35-8542B Coolant Temp Faceplate, Black
  • 1x Faceplate Configuration Instructions
  • 1x Paper Clip Needle Removal Tool


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