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Where to get 12V for air vent gauge

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Hello:

 

I need some help. Where can I get positive charge for fitting one air vent gauge (my car is LHD).

 

Thanks

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There is a 12v cable leading into he back of your head unit that you could splice into which I've did when fitting my reversing camera when I was worried the 6v (I think) camera lead wouldn't be enough to power the camera I'd brought, turns out it was and now I've got a spare 12v connection behind my head unit.

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