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Old 12-06-2003, 08:26 PM   #1
odin1
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Default Autometer a/f ratio gage- best location to hook up power. Need help quick-please.

Tried to hook up my autometer a/f gage. have 2004 sti-mods- godspeed catless downpipe-greddy evo exhaust-marc hallman manual boost contoller-17psi-no boost spiking-no boost creep!-best mbc imho. a/f gage comes with it's own o2 sensor-necessary because our o2 sensors are wideband-0-5 volts and autometers gage reads 0-1 volt. Have godspeed downpipe-catless with o2 sensor bung near turbo outlet flange-installed provided 0-1 volt 02 sensor here. What's the best place to hook up the power wire and where is it located? I need a power on source-not an accessory source for power. Any one have a wiring diagram. Currently have hooked up power to cigarette lighter fuse. Gage works, but reads totally lean on full throttle. I checked out a/f operation using a snap-on diagnostic tool-plugs into diagnostic port-reads rich thru-out rpm band. Therefore autometer gage way off. Sorry for long post but very frustated. Help!!
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Old 12-06-2003, 08:27 PM   #2
odin1
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bump
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Old 12-06-2003, 10:32 PM   #3
odin1
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Default is there anybody out there?

Surely, one of you can help.
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Old 12-07-2003, 12:12 AM   #4
enewtabie
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Tap it into your ecu.I have mine in the center pod with two other gauges.It doesnt give an accurate reading since it reads off the rear 02. B17 in the wire on 02's,its a white wire


tap power from the factory clock.
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Old 12-07-2003, 12:24 AM   #5
nhluhr
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the STI has a different pinout than the WRX, eric, so B17 is probably no longer the correct wire.

Somebody recently posted a pinout for the car. You need to tap the purple wire from the Autometer gauge into the Rear O2 Sensor "signal" wire.

The black wire goes to ground, and the red wire goes to your "IGN" circuit (such as the yellow wire on your stereo or something)
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Old 12-07-2003, 01:24 AM   #6
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Maybe this thread is some help.
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Old 12-07-2003, 01:45 AM   #7
enewtabie
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Quote:
Originally posted by nhluhr
the STI has a different pinout than the WRX, eric, so B17 is probably no longer the correct wire.

Somebody recently posted a pinout for the car. You need to tap the purple wire from the Autometer gauge into the Rear O2 Sensor "signal" wire.

The black wire goes to ground, and the red wire goes to your "IGN" circuit (such as the yellow wire on your stereo or something)

Your right,Nick. I keep forgetting about the sti.
Disregard my info about the pin number.
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Old 12-07-2003, 02:48 AM   #8
odin1
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thanks guys. All I'm really looking for is the color and location for the red power wire hook-up. My a/f meter has it's own o2 sensor and plugs directly into gage-see my post for more details. Don't need to tap into ecu.
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Old 12-07-2003, 03:11 AM   #9
nhluhr
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just hook it up to anything that is powered from the main ignition circuit. if you're mounting the gauge close to where the radio would be, i believe the yellow wire in there is the one. Otherwise, you could tap off the lighter plug wire.
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Old 12-07-2003, 07:27 AM   #10
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He doesn't need to tap the ECU rear 02 wire since the gauge already has a dedicated sensor. Just a source of switched 12V should be needed.
Since the supplied sensor is still narrowband though, accuracy of the gauge won't be very good.
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Old 12-08-2003, 06:55 AM   #11
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you do know that a narrow band 02 A/F gauge is next to useless right? Its a light show nothing more.
That said, tap any switched 12v. If needbe just extend a wire from behind the radio to the gauge. Enjoy
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Old 12-09-2003, 12:17 AM   #12
PeteDucati
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I forgot what color wire I used under the dash. Using a cheapie test light you can figure out what wires have constant power and which ones are key-on. It also might be hard to get the gauges to dim, I believe Subaru uses a reverse ground or something like that.

My GReddy P/H/W Air/Fuel gauge (~$250) was so annoying I got rid of it. I ditched the column mounted boost gauge for a 60mm one. And the GReddy A/F had a semi-wideband O2 sensor. I tried several different locations and a new sensor before giving up. The needle only seemed accurate during a quality WOT run.. other wise it was flopping back and forth and flashing the damn warning light all the time.
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