Autometer A/F gauge

Jim Green jeg1976 at
Wed Jan 29 09:30:48 EST 2003

--- "Lino M. Valadas" <l.valadas at> wrote:
> Help!
> I'm trying to hook up an Autometer A/F gauge to my
> MAC 11'd Ur-q with not
> much success.
> Simple connection really, the gauge has three wires:
> red - 12v, black -
> ground and purple - O2 sensor signal.
> I tried taping into the 12v terminal at the
> electronic ignition and the
> gauge just lit up at several  spots along the scale
> which is not correct.  I
> assumed there was something wrong with the gauge and
> sent it back to
> Autometer who very kindly replaced it.  Tried my new
> one, same hook up, same
> results.  I don't think I could have gotten two bad
> gauges.  have I blown
> them?
> I have check all my sources of power/grounds with a
> voltmeter and all is
> cool.  My WG frequency valve is connected to this
> terminal and is working.
> Also the car will not start with the gauge connected
> this way.  When I move
> the red wire to another 12v source the car starts
> but the gauge acts as
> before.  Should I make all my connections at the
> ECU?
> Has anybody successfully hook one of these up to a
> Q?

Yes, I have one, and it works great.  Try hooking the
positive wire strait off the ignition switch
somewhere, and ground the - to the engine block.  I
had a lot of problems with noise on my guage due to
not grounding it to the block.  I've also found that
since I switched to a 4-wire sensor, the noise has
been eliminated.


Jim Green
'89 90tq 034EFI, Haltech IG5

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