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Murphy 300F Swichgage Temperature Gauge EGS21T-300-12

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Murphy 300F Electric Temperature Swichgage 12 VDC - EGS21T-300-12

Product Condition: NEW
Murphy 300F Electric Temperature Gauge 12 VDC EGS21T-300-12
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy 300F Electric Temperature Swichgage 12 VDC EGS21T-300-12 takes the electric gage to new heights with proven state of the art technology and reliability. This gauge has 140-300° F temperature range and exceeds the rigid SAE J1810 standard for reliable operation under tough off-road and power unit environments. Unit features an adjustable set point PowerHall Effect switch output for operating alarms or equipment shutdown. The trip point is adjustable over 90% of the scale and has a set point indicator visible from the gage face.


  • EG Air Core movement design
  • Technological improvements in lighting, accuracy in reading and wiring installation
  • Assurance of highest reliability and service
  • Environmentally sealed design
  • Exceeds the rigid SAE J1810 standard
  • Corrosion-resistant materials
  • Desirable for marine and other environmentally sensitive applications
  • Soft, non-glare dial and pointer illumination by “cold light” LED
  • Adjustable set point powerHall effect switch output



  • Part No.: EGS21T-300-12
  • Range Scale: 300°F (149°C)
  • Power Input: 12 VDC
  • Case: Polyester (PBT), impact and weather resistant with screw-on mounting clamp
  • Bezel: Polished 316 stainless steel standard
  • Lens: Clear Polycarbonate and UV stabilized
  • Air Core Movement: Silicon dampened pointer
  • Dial: Black with white markings; back-lite (marking becomes red when illuminated); dual scale with mirror band to reduce parallax reading errors
  • Swichgage instrument Sensor: PowerHall Effect; outputs ground signal (sinking output) rated: 300 mA continuous (EGS21 models).
  • Swichgage instrument Set Point Indicator: Visible on mirror band (scale); adjustable from the back of the unit (1/16 in. hex type wrench
  • Wiring: Plug connector with wire leads, 18 AWG (1.0 mm2), 8 in. (203 mm) long
  • Operating Temperature: -40 to 185°F (-40 to +85°C)
  • Storage Temperature: -77 to 185°F (-60 to 85°C)
  • Over Voltage (Gage Movement): Withstands 200% of nominal system voltage for 5 min. Meets SAE J1810
  • Reversed Polarity (Gage Movement): Withstands reversed battery terminal polarity indefinitely within operating temperatures
  • Environment and Test: Meets SAE J1810 standards

Additional Information

Product Condition NEW
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