Gauge wiring question

[Jay C]

I am in the middle of installing my AEM boost and UEGO gauges and am unsure where to wire them. There was a really good write up but I have been unable to find it. I have seen several people say that they can be wired into the cigarette lighter and I like that as it would be easy to work on and to undo if I ever want to. The gauges need 12v power (red wire), Ground (black wire), Switched 12v power (pink wire), and instrument lights (Grey). The lighter has Positive 12v acc key (blue/red wire), Ground (white/black), Illumination 12v live w/ side lights (green wire), and Illumination bulb ground (white/green).

Now can I just tie in my red and pink wire to the cigarette blue/red wire? or do I need a separate 12v non switched source for the red?
The black wire would go to the cigarette white/black.
The grey wire to the cigarette green (illumination) wire? or should I use the 12v power for the little bulb in the ashtray as I believe that is off the dimmer?

Thanks for any help. I can't really check some of this as my dash is mostly apart and I don't have a battery in the car atm.

 

[suprarx7nut]

You want a 12V constant in addition to the switched 12V wiring. I made a make-shift terminal block out of a 10 pin connector set for both accessory and constant 12V to feed my gauges and anything else that will need 12V. You can get the signal from a wire under your dash (above your feet), in the driver's kick panel, or behind the stereo.

Looking at the TEWD might help.
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=128

If you want the gauge to dim with your lights (a classy feature) you'll need to tap into the White-Green wire (white with a green stripe) shown here coming off the light control rheostat:
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=62

 

[Jay C]

Another option I have is to use the gauge cluster as it is off while I swap in a voltmeter where the stock boost gauge was. I see a place for power which I assume is 12v constant, ign+ which I assume would work for the switched 12v, and earth which I could use for ground. Is that all correct so far? If so is there any way to pick up the dimmer from back there? If not I'll use the white/green wire off the rheosrat.

 

[Backlash2032]

Get some add a fuses for switched and constant power, tap into the radio harness for the dimmer, and then ground them somewhere. Done.

Sent from my HTC6435LVW using Tapatalk

 

[Jay C]

Thanks for all of the help. My gauges are working and dimming perfectly. They and my pillar pod are now finally mounted up and looking good.