EG / EGS Series Series Electric Gauges

The EGS21 Series Swichgage instrument has all of the features of the EG21 Series Gage plus 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. Now you can have both, the ease of electric gage installation and the reliable switching of Murphy’s famous Swichgage instrument.


• EG Air Core Movement Design

• Technological Improvements in Lighting, Accuracy in Reading and Wiring Installation

• 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

  • Notes

    Power Input, all models and sender: 12 VDC or 24 VDC.

    Case: Polyester (PBT), impact and weather resistant with screw-on mounting clamp.

    Bezel: Polished 316 stainless steel standard; available in black. SAE style optional.

    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). Pressure, Fuel, Volts set on decreasing scale. Temperature and Amps set on increasing scale.

    Output saturation voltage (voltage drop across switch): 1.3-2.3 Volts @ 25°C (may require some conditioning to work with logic inputs)

    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.

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Service done right

FW Murphy Service Network

Palmer Johnson's six-location factory-authorized service center network features:

  • Factory-trained technicians
  • Field service
  • Onsite troubleshooting and diagnostics
  • Unit removal and installation

For FW Murphy service, call 1-800-341-4334.

Learn more

Madison, WI

Service Center

Service: (608) 834-5206

1835 Haynes Dr
Sun Prairie, WI 53590


Dallas, TX

Service Center

Service: (817) 505-2430

608 112th St
Arlington, TX 76011


Denver, CO

Service Dealer

Service: (720) 724-0033

5151 E 56th Ave
Commerce City, CO 80022


Kansas City, KS

Service Center

Service: (913) 202-6944

15360 South Mahaffie St
Olathe, KS 66062


Los Angeles, CA

Service Center

Service: (562) 356-1590

12020 Bloomfield Ave
Santa Fe Springs, CA 90670


Oklahoma City, OK


Sales: (800) 341-4334

Oklahoma City, OK 73128


Phoenix, AZ

Service Dealer

Service: (602) 253-0214

2401 S. 19th Street
Phoenix, AZ 85034


San Francisco, CA

Service Dealer

Service: (510) 342-2212

1930 W Winton Ave #14
Hayward, CA 94545


St. Louis, MO

Service Center

Service: (636) 203-9811

578 Rudder Rd
Fenton, MO 63026


Philadelphia, PA

Service Dealer

Service: (215) 822-8300

159 Discovery Dr
Colmar, PA 18915


Fort Myers, FL

Service Dealer

Service: (239) 693-7477

4821 Waycross Road
Fort Myers, FL


Vancouver, British Columbia

Service Center

Service: (604) 879-6731

6741 Cariboo Rd Unit 205
Burnaby, British Columbia V3N 4A3


Edmonton, Alberta

Service Center

Service: (780) 434-9578

3804 53rd Ave NW
Edmonton, Alberta T6B 3N7


Seattle, WA

Service Center

Service: (425) 251-3434

1710 136th Ave E Suite 200
Sumner, WA 98390


RECON Equipment Center, WI

Service Center

Service: (608) 834-5220

1828 Haynes Dr
Sun Prairie, WI 53590

Map of Palmer Johnson Power Systems locations