Installing an A/F Gauge

TOOLS NEEDED:

Drill

2" hole saw (only if you are not using a gauge pod)

wire

hot glue gun

wire strippers

PREP:

Remove the plastic cover in the driver's footwell. This is accomplished by removing the four 7mm bolts holding it on at the corners. Loosen the nut on the back of the hood latch cable to remove it from the plastic cover. Use a flat blade screwdriver to gently pop the OBD-II connector out of its socket.

INSTRUCTIONS:

1. Mark the area you want to make your hole. Make sure the location is centered and visibility is good, you don't get a second shot at this. Use the 2" hole saw to drill the hole.



2. Make a hole in the firewall to run your sensor signal wire thru. Be very careful with this. Make sure that both sides of the firewall are clear of wires, lines or parts. I chose to drill a small hole just above the throttle cable.





3. Run your length of wire thru and conceal it in the factory wiring harness loom. Its very important that this wire does not melt and ground out. Grounding will result in damage to the O2 sensor.

4. When you have reached the 1st O2 sensor find the black wire on the O2 harness.

5. Unless you want to rewire your gauge every time you change the oxygen sensor, you'll need to splice your gauge wire in BEFORE the O2 harness. If you look on the main side of the connector, you'll see that the corresponding wire is the white one. Strip away some of the insulation and wrap your gauge wire around it. Solder this connection and cover with tape or heat shrink tubing.



6. Connect your gauge power wire to the bottom terminal of fuse 50. This is your ACC power. This power is only present when the key is turned to ACC or ON. I already have something wired in to that fuse so I tapped off  a wire already running to that fuse. (my next how to will be about making an ACC power distribution block)



7. loosen one of the bolts that holds the fuse box to the metal frame. Slide your ground wire under there and tighten the bolt over it. This is your gauge ground.

8. Run all three wires to your gauge hole and tape them out of the way along their path.

9. Connect the wires to the gauge. For autometer gauges, the purple wire is your signal wire. Red is power and black is ground.

10. Use the hot glue gun to glue up the hole in the firewall. This will prevent the wire from chaffing and grounding out on the chassis. This will also keep any water or debris from entering the footwell.

11. Set the gauge in the hole and test it out.

 How To Courtesy Of TXFO