AEM 30-5141 Analog H2O Flow Gauge - Manual (Page 2)

Page 2
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.