# Gauge Question...

**URL:** <https://forums.speedlife.net/t/gauge-question/95335>\
**Category:** SON240sx Automotive\
**Created:** [April 27, 2006, 12:05pm UTC](https://forums.speedlife.net/t/gauge-question/95335 "2006-04-27T12:05:31Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Head](https://avatars.discourse-cdn.com/v4/letter/h/e56c9b/32.png) [@Head](https://forums.speedlife.net/u/Head)\
**Post date:** [April 27, 2006, 12:05pm UTC](https://forums.speedlife.net/t/gauge-question/95335/1 "2006-04-27T12:05:31Z")

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Got a couple of these Megan Temp Gauges, H2O and Oil… I misplaced the boxes and was wondering if anyone has a quick Link or off the top of there head can tell me what the 4 Colored wires are mean…

From What i remember…

Blue - ?

Red - Power?

Black - Ground?

Purple - ?

Thanks

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**Author:** ![sidewaze](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sidewaze/32/5497_2.png) [@sidewaze](https://forums.speedlife.net/u/sidewaze)\
**Post date:** [April 27, 2006, 12:43pm UTC](https://forums.speedlife.net/t/gauge-question/95335/2 "2006-04-27T12:43:38Z")

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Red is Power, Black is Ground, Purple is your signal wire and blue I don’t remember using. I had my guages (in my old 240) wired to the headlights using the red wire so when I turned those on, the gauges lit up too.

I hope that helps out a little. 😃

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**Author:** ![Head](https://avatars.discourse-cdn.com/v4/letter/h/e56c9b/32.png) [@Head](https://forums.speedlife.net/u/Head)\
**Post date:** [April 27, 2006, 1:01pm UTC](https://forums.speedlife.net/t/gauge-question/95335/3 "2006-04-27T13:01:22Z")

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Blue has something to do with the Dimmer Switch or ON/Off sWitch

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**Author:** ![sidewaze](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sidewaze/32/5497_2.png) [@sidewaze](https://forums.speedlife.net/u/sidewaze)\
**Post date:** [April 27, 2006, 1:07pm UTC](https://forums.speedlife.net/t/gauge-question/95335/4 "2006-04-27T13:07:15Z")

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^^^^

Oh yeah that was it. Well like I said, if you wire them to your headlights you don’t need to use the blue wire. I had Megan’s in my car and you can see them just fine during the day and they actually dim for night use when I turned on my headlights.

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**Author:** ![jlee](https://avatars.discourse-cdn.com/v4/letter/j/898d66/32.png) [@jlee](https://forums.speedlife.net/u/jlee)\
**Post date:** [April 27, 2006, 6:03pm UTC](https://forums.speedlife.net/t/gauge-question/95335/5 "2006-04-27T18:03:32Z")

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here’s what is says right on the box… just to make sure… red is +12v, black is ground, blue goes to temp sensor, and purple is the dimmer