Cyberdyne Air/Fuel Ratio Gauge Installation and Troubleshooting

2 1/16? Gauge Instructions

Warning: Before doing any work on any kind of vehicle, disconnect the negative (-) battery cable. Failure to do so may result in burns, electrical shock, or other personal injuries and damage to vehicle.

Recommended installation technique:

Decide on a location to mount the gauge(s).
Drill, cut and do whatever it takes to get the location ready to install the gauge(s).
Install the sender(s) and switch(s), if applicable. Refer to section 'sender installation'.
Install the gauge, but do not secure into place.
Make all wire connections. Refer to section 'Gauge, sender, and switch wire connections'
Make sure all gauge(s) are functioning. If any problem refer to the section 'trouble shooting'.
Secure the gauge in place.

Air Fuel Installation

1. Red wire: Connect to a 12 volt + source.

2. Black wire: Connect to a good ground source.

3. Orange wire: Connect to the wire from the Oxygen sensor that runs to the factory computer.

Note: All wires routed through the firewall should be run through a grommet.

Tip: Identifying the signal wire on 3 and 4 wire Oxygen sensors. The wire colors vary, but two wires are normally the same color. Most often two black or two white wires.. These are for the sensor heater. On 3 wire sensors the 3^rd odd color wire is the signal wire. On 4 wire sensors the 3^rd and 4^th odd color wires are the signal and signal ground wires. Try one, if proper gauge operation is not observed try the other wire. Improper hook-up will not damage the gauge, sensor, or computer.

A/F Gauge Operation

With the key on but the engine not started, the gauge should not have any bar graphs lit or on. The air/fuel, rich and lean symbols should be on.

Start the engine. Normal operation of the gauge will not occur until the sensor and engine are at proper temperature. The gauge will have either no bars on or read lean before the sensor reaches temperature. Anywhere from 1 to 4 minutes. When the sensor reaches temperature but the engine is still below running temperature the gauge will tend to read rich.

When engine is at running temperature and is at cruse or idle the gauge will toggle between rich and lean. This is normal for newer cars with the computer controlled fuel systems.

With throttle in an open position the gauge should go towards rich.

Bar Graph	1	2	3	4	5	6	7	8	9	10
	Red	Red	Yellow	Yellow	Green	Green	Yellow	Yellow	Red	Red
Ratio for:
Gasoline	17.1:1	16.5:1	16.0:1	15.4:1	14.9:1	14.4:1	13.8:1	13.2:1	12.7:1	12.1:1
Alcohol	7.6:1	7.3:1	7.1:1	6.8:1	6.6:1	6.3:1	6.1:1	5.8:1	5.6:1	5.3:1
Propane	17.9:1	17.3:1	16.8:1	16.3:1	15.7:1	15.2:1	14.6:1	14.0:1	13.5:1	13.0:1

Troubleshooting

Gauge does not light: Check the positive (+) red wire connection and the negative (-) black wire connections.
Gauge blows fuses when connected: Check for short circuits between positive (+) red and negative (-) black connections.
Gauge always reads either full rich or lean: Check the orange wire for an open or short circuit. Check for a defective sensor.
Gauge responds slowly: Defective oxygen sensor.

Flitz