Murphy EG21, EGS21 User Manual

EG21 and EGS21 Series Electric Gage and
SWICHGAGE

®

Installation

For Pressure, Temperature, Fuel Level, Voltmeter and Ammeter

EG21-96048N
Revised 05-05

Section 70

(00-02-0251)

Patents 5121109, 4975687 and 5608386

CAUTION

Gage Installation

Pressure Sender

Temperature Sender

Fuel Level Sender

CAUTION: Extreme caution must be used in handling or working on or around the fuel tank. It must be worked on only in a

WELL VENTILATED area. Keep all flame and hot materials away from it. Do not smoke while working on or around the tank.
Avoid sliding or dragging the tank, or other actions which may cause a spark.

CAUTION: Do not use sender body to tighten.

If sealant tape or pipe dope is used on the
pressure sender, be sure that the tape or dope
does not plug the sender’s orifice.

Tank Installation

Shaft

Float Arm
Connector
See View A

Float

Arm

1/4 in.

(6 mm)

Float

Arm

Float Arm

Connector

View A

Gasket

Mounting Plate
(see Mounting Hole Dimensions)

Shaft

Arm

Mounting Hole Dimensions

Sender Installation

IMPORTANT NOTICE FOR ALL EG21 ELECTRIC GAGES AND EGS21
ELECTRIC SWICHGAGE®S FOR 24VDC

AND 32VDC APPLICATIONS

A change in the dial illumination circuit has made it necessary to change the external wiring harness.
If you use the incorrect wiring harness, irreparable damage will occur to the gage mechanism.

The table below lists correct wire harness assemblies for units by manufacturing date. For
date code R1 (January 1996) or earlier (Q12, Q11, etc.) the wire harness can be identified
by P/N and by BLACK shrink tubing on the YELLOW wire. For date code R2 (February 1996)
and later (R3, R4, etc.) the wire harness can be identified by P/N and by RED shrink tubing
on the YELLOW wire.

Date Code R1 or Earlier Date Code R2 or Later

05004546 05006166
05004547 05006167
05004548 05006168
05004549 05006169
05004550 05006170
05004551 05006171
05004552 05006172

If dial illumination is NOT required, either wire harness can be used on any date code, if the
YELLOW wire is NOT connected.

EG21-96048N page 1 of 2

3/4 in. (19 mm)

maximum thickness

Push-on Plug
and Wire Leads

Set Point Adjustment

(SWICHGAGE

®

only)

Panel

Mounting Clamp (Reversible)

For Thick
Panels

Mounting Hole

2-1/16 in. (52 mm) Diameter

Plug-in

Connector

For Thin
Panels

68.5

Sender
(Typical)

Engine block
pressure port

Sender

Adapter

Copper
Washer

Engine
Block

72

1-3/4 in.

(44 mm)

5/32 in.
(4 mm) dia.
5 Holes

dia.

Mounting Plate
2-3/4 in. (70 mm)
diameter

72

1-1/16 in.
(27 mm)
radius

68.5

EG21-96048N page 2 of 2

Pressure, Temperature, Fuel Level and Voltmeter Gage

Ammeter Gage

Light Switch

Battery

ON/OFF
Switch

Red

Black

Yellow

*

Battery

Alternator

Black

Yellow

*

WARNING:

DISCONNECT
BATTERY
NEGATIVE
CABLE BEFORE
WIRING OR
SERVICE.

*

Yellow wire is optional for gage illumination and
does not need to be connected for gage to operate.

Sender Wiring

Grounded Sender

Ungrounded Sender Dual Gages with Dual Gage Sender

Blue

Black

Blue

Black

Sending Unit

Blue

Sending Unit

Blue

Black

Sending Unit

WARNING: DISCONNECT BATTERY NEGATIVE CABLE BEFORE WIRING OR SERVICE.
CAUTION: Connecting full Battery potential to the brown wire can damage the SWICHGAGE

®

. Shutdown circuit is rated for

300 mA continuous, 900 mA inrush. Circuit grounds out at set point.

Battery

ON/OFF
Switch

Red

Red

Black

Brown

Orange

Fuel Valve

Diode Package

Black

518APH

Magnetic Switch

GNONC SW1 SW2 B

Orange

Battery

ON/OFF
Switch

Red

Brown

Alarm Device or

Shutdown Relay

OBSERVE ELECTRICAL RATING

Black

SWICHGAGE®Wiring

Basic Wiring

CAUTION: Devices containing solid

state components can be damaged or
caused to malfunction when used in systems
which incorporate inductive loads (e.g. relays,
solenoids, etc.) that can generate voltage spikes.

To reduce the potential for this type of damage,
install a flyback or clamping diode across all
inductive loads (see wiring diagram shown right).

Use Murphy diode package 65-00-0343 or
equivalent. A typical diode is 1N4005 which is
readily available from commercial sources. Failures
of this type are not covered by our Limited Warranty.

Warranty

A limited warranty on materials and workmanship is given with this FW Murphy product.

A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm

INDUSTRIAL PANEL DIVISION

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone] fax [phone]
e-mail [e-mail]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone] fax [phone]
e-mail [e-mail]

www.fwmurphy.com

Printed in U.S.A.

*Model 518APH is the only Murphy

recommended Tattletale®for use
with the EGS21 series Electric
SWICHGAGE®.

*