AEM 30-5142 Analog H2O Flow Gauge User Manual

Part Number 30-5142

1000 cc/min Water/Methanol Injection Flow Gauge

Figure 1. Wiring Schematic

This product is legal in California for racing vehicles only and should never be used on public highways.

AEM Water/Methanol Injection Flow Gauge Parts

1 x 35-5142(B/W) Flow Gauge Assembly
1 x 35-2126 Flow Sensor with Fittings
1 x 35-4302 Install Kit (6 Butt Connectors)
1 x 10-5142 Installation Instructions
1 x 35-3411 8-Pin Power Harness
1 x 35-3415 3-Pin Sensor Harness
1 x 35-8529S Silver Bezel
1 x 35-8441 Rubber Band

AEM Performance Electronics

th

2205 126

Phone: [phone] Fax: [phone]

Street Unit A, Hawthorne, CA. 90250
http://www.aempower.com

Instruction Part Number: 10-5142 Rev 01

© 2009 AEM Performance Electronics

INSTALLATION

1. Disconnect the negative battery cable.

2. Secure the gauge in a 2 1/16” (52MM) mounting hole with the supplied bracket. Use
the supplied rubber band as a spacer around the gauge if it fits loosely into its
mounting hole.

3. Plug the 8-wire power harness into the mating connector on the back of the gauge
and connect the wires as shown in Figure 1. The power harness connector can only
be inserted one way.

4. Install flow sensor as close as practically possible to final injection point. Verify that
arrow on sensor points in the direction of flow. **NOTE**: It is highly

recommended that the AEM Water/Methanol Injection Filter (AEM part# 30-

3003) be used in conjunction with this flow gauge. Using a filter will maximize
the performance and longevity of your flow sensor as well as your entire
injection system.

5. Plug the 3-wire sensor harness into the mating connector on the back of the gauge.
Insert the sensor harness connector so the two locating tabs point down.

RED - Connect BOTH RED wires to a constant 12 volt power source utilizing a 5A fuse.
BLACK – Connect BOTH BLACK wires to a clean power ground.
PINK – Connect to a switched 12 volt power source utilizing a 5A fuse.
GREY - Connect to instrument lighting circuit supply voltage.
*WHITE - Connect to Analog + Input.
*BROWN - Connect to Analog – input. (Must be connected if Analog + is used)

*Optional – only needed if using the available differential analog output

Wiring notes:
RED - When wired as shown above, the gauge will park the needle against the needle

stop upon powering down. Alternatively, both RED wires can be connected to the same
location as the PINK wire. With both RED wires and the PINK wire connected to the
same switched power, the needle will remain at its current position upon powering
down. For both power connection methods, the needle will rotate to the parked position
before rotating to the value of the current operating condition upon powering up.

GREY – The GREY wire is used to control the lighting intensity of the gauge. Maximum
lighting intensity is achieved when the GREY wire is connected to 12 volts. Minimum
lighting intensity is achieved when the GREY wire is not connected. The
instrumentation illumination on many vehicles is controlled by varying the supply voltage
to the instrument panel lights. When the GREY wire is connected to the instrument
panel supply voltage, the intensity of the gauge is controlled by the dimmer switch on
the dash.

WHITE – The WHITE wire should be connected to the Analog + input on the AEM EMS
or the analog + input on a similar device.

BROWN – The BROWN wire should be connected to the Analog – input. If the EMS or
similar device does not have a – input, the BROWN wire should be connected to a
sensor ground. If no sensor ground is available, the BROWN wire should be connected
to a power ground. Note: The BROWN wire must be connected in order to get
correct readings from the analog output.

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Changing the Bezel

The AEM Water/Injection Flow Gauge comes with the black bezel installed. However, a
silver bezel is also included in the gauge kit. To change the bezel, orient the gauge so
you are looking at the faceplate. Rotate the bezel counter-clockwise to unscrew it from
the gauge cup. The bezel, lens, and rubber spacer are all removable. Reassemble the
gauge as shown below in Figure 3. Note: When reassembling the gauge, it may be
necessary to apply a light amount of pressure on the lens and spacer to keep the
faceplate from rotating when reinstalling the bezel. Do not over tighten the bezel

when reassembling the gauge.

BEZEL

LENS

RUBBER

Figure 3. Changing Bezels

SPACER

Backlighting

The AEM Water/Methanol Injection Flow Gauge has 7 different backlight colors
available to the end user, which closely match some of the more common factory dash
panels: white, blue, green, red, orange, light blue, and aqua. To change the backlight
color, rotate the backlighting switch using a small precision style screwdriver. The
backlight switch is accessed through the small hole in the back of the gauge.

ACCESS

PORT

Figure 4. Backlighting Adjustment

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