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Hello,

I've fitted a booster gauge in the dash panel next to the lighter on my T4. The gauge has a black and a white wire out of the back as the feeds for the backlight bulb. I'm thinking of tapping into the wiring in the back of the lighter to get the gauge working. The lighter plug has 3 wires into it, can anyone help me identify which wires are the feeds I need?

Thanks
 

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The thin grey/blue wire is the back light positive and the brown is negative.
 
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