wiring up air fuel ratio leds....

[DJ984]

Hey guys, my mate gave me a lil led display that you wire up as an air/fuel ratio display....

The wires are:

positive, negative and O2 sensor.... Ok, so the first 2 are a piece of piss....

actually, should i wire the positive throu accessories (cigi-lighter cable) or straight to battery? or other?....

now, the question i an totally stuffed on.... the O2 wire.... where and how???

all help appreciated... diagrams are excellent....

cheers.

Dave.

[blind_elk]

From memory, you need to tap into the white wire off the O2 sensor. Check it with a multimeter - output should vary between 0 - 1V.

Hook the power off the ON posi - ie only supply power while the engine is running.

[sewid]

O2 Sensor sticks out of the exhaust/dump pipe close to the turbo. Easy to spot, has a wire coming out the back of it.

[DJ984]

Ok, i know the sensor your talking about now.... might be fun to get to... lol....

blind_elk: when you say to hook the power off the On posi (i'm guessing the ignition switch)... how do i get in there (neva been there on this car)... just take the steering casing off? which wire? (colours etc)...

thanks again.

[blind_elk]

Just need to find something that only works while the engine is running - maybe something like the wipers (I can't remember how I did mine).

It's not so hard to splice into the wire at the sensor, but you could alternatively pick up pin 29 at the ECU.

[DJ984]

kool... that's easy enough then....

How do i know which one's pin 29? havn't had a good look at the ECU l8ly....(or at all for that matter)....

[sewid]

Yeah its "easier" to splice into the wire AFTER its through the firewall. But finding that wire is bit tricky. You could use a continuity tester or just try and follow the colour coding.

[DJ984]

Ok, so i'm guessing i'll be taking out the floor in the passenger foot well and looking for that wire then?...

then what would you suggest i spliced the +ve wire into? If i connect it to the ciggi lighter will it work without a switch?.... I've only ever hooked the neons up through that wire.....

[predator]

cigarette lighter is fine, and will when accessories turned on, which is what most guage stuff can be hooked to.