Air Fuel Ratio Gauge
Here are some pics of installing an air fuel ratio gauge on my Stealth.
This includes running the wires, wiring a switch that allows either the front or the rear air fuel ratio to be measured.
Also, check out the Custom A/F Gauge Face Plate that I made for the gauge.
Here is a description of what I did, and how I did it.
It is not extremely detailed, and if there are any questions, email me at
rdmelton@hotmail.com.
I had read some ideas on hooking up an a/f gauge so that it could read from either the front or the rear 02 sensor,
so I tried doing that over my spring break.
This isn't step by step instructions, but basically it was pretty simple, and here's what I did:
I used something similar to car trailer wiring to get 4 wires that were attached to each other,
and ran them from the ashtray through the console(I just popped out the panel where active aero hooks up on a vr4,
and managed to get my hands in there enough to run the wire).
Then by the pedals, I split 2 of them toward the fuse box, and 2 of them went through the firewall.
I took the 1 wire to the fusebox, and hooked in directly to an empty slot that works only with ignition in
on position(put in an inline fuse), and grounded the other on a bolt nearby. I took the other 2 wires,
and hooked one on each blue wire on the 02 sensors (pic from
Stealth 316 Oxygen Sensor Locations were VERY helpful on locating the 02 sensor wires.)
Note: The wire color may vary from year to year, but the position of the wires should be the same. It is pin #4 of the harness, which is located on the lower left when looking at the harness side connector(with the harness disconnected, looking at the pins), or the lower right when looking at the equipment side connector. (again with the harness disconnected, and looking at the pins)
Alternatively, the wires to each O2 sensor can be tapped at the ECU. This will make for much shorter wiring, if you are comfortable with messing with the big bundles of wires at the ECU. To get to the ECU, remove carpeted panel on driver side of center console. The ECU is mounted vertically behind the radio with the wiring harnesses facing the driver side.
The wires for the O2 sensors at the ECU can be found in the table below, or by using the Stealth 316 ECU Info Page
Then I used a 4 wire trailer plug in the ashtray area, so I could easily remove the gauge at any time.
After the plug, I put the 2 wires from the 02 sensors into a 3 way switch ($8 from NAPA),
and had one outlet wire from the switch, which went into the a/f gauge.
This switch allows me to choose either the front or rear 02 sensor.
Finally i hooked up the wires from the fusebox, the ground,
and the wire from the "out" side of the switch into the a/f gauge.
It seems to be working ok, and i think it looks pretty cool there.
It isn't the best location for viewing while driving, but i really don't see it as being necessary to check constantly,
so that's not a problem.
***Note, be careful when running the wires, and adding ties to hold the wires......
stay away from accelerator pedal and throttle cable.............enough said***
Overall, just be sure to double check your wiring to make sure all colors match on the intended and actual use of each wire.
(Make sure the ground wire goes to a ground, etc) Other than that, it's not too difficult,
and it's another neat gauge to amaze people when they see the interior, as well as having a practical purpose.
The face plate was made by starting with a large piece of plexiglass, and estimating a size for the plate.
From there, I just used a grinder to SLOWLY grind away some of the material,
until it eventually was just barely small enough to sit on top of the lip where the ashtray used to sit.
I also very lightly painted the back side of the piece of plexiglass,
which gave the plate a pretty natural look inside my interior.
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