if you look at page 4, white is headlights
1. Connect the RED wire to a switched 12V source. A switched 12V source goes on as
soon as the ignition on the car is on. Make sure the connection is fused with a
minimum fuse size of 3A.
2. Connect the BLACK wire to a ground source. Avoid noisy ground sources, such as
grounds used for radio and or ignition sources.
3. Connect the WHITE wire to a headlight power wire (a wire that supplies current to
the headlights). This enables the display to dim for better nighttime viewing. DO
NOT CONNECT THIS WIRE TO THE HEADLIGHT DIMMING WIRE. Connection to
this rheostat type of switch will cause the gauge to malfunction. If you chose not to
utilize the dimming feature, connect the WHITE wire to ground.
4. Optionally, the YELLOW (Analog out 1) and/or BROWN (Analog out 2) can be
connected to the analog inputs of other devices such as data loggers or ECUs. If
either one or both of these wires are not being used isolate and tape the wire(s) out
of the way. The default analog outputs are as follows: Analog output one (yellow) is
0V = 7.35 AFR and 5V = 22.39 AFR. Analog output two (brown) is 1.1V = 14 AFR
and .1V = 15 AFR. This is a simulated narrowband signal.