# Need Help Now...Air/Fuel Gauge & Boost

**URL:** <https://forums.speedlife.net/t/need-help-now-air-fuel-gauge-boost/81396>\
**Category:** SON240sx Automotive\
**Created:** [August 6, 2004, 11:14am UTC](https://forums.speedlife.net/t/need-help-now-air-fuel-gauge-boost/81396 "2004-08-06T11:14:51Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![NeveR](https://avatars.discourse-cdn.com/v4/letter/n/e95f7d/32.png) [@NeveR](https://forums.speedlife.net/u/NeveR)\
**Post date:** [August 15, 2004, 2:41pm UTC](https://forums.speedlife.net/t/need-help-now-air-fuel-gauge-boost/81396/21 "2004-08-15T14:41:38Z")

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I’ve definately got the sucker grounded. It lights up and everything but absolutely no needle movement from the air/fuel gauge…Maybe it’s fried?? I have no idea. My boost gauge works well.

I have 4 wires coming from the gauge:

- RED: 12V ignition power (I have it wired to the driver side door so the gauge lights up only when the door is closed)
- BLACK: Ground (Connected to chassis)
- GREY: Signal (Attached to the white signal wire, the 02 sensor has three wires coming directly from it (white, black, white) it then hits a clip and turns into three different coloured wires (black, white, black). I have it connected to the middle center wire (white) past the clip)
- PURPLE: it says to connect this wire to the headlights to activate but due to my door switch ingenuity this wire is not needed.

Have I done something wrong???

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