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I was under the impression that one of the great things about PLX gauges in particular was their ability to "daisy chain" together so you don't need to do that.
I'm planning on doing the same install, but I haven't heard anything regarding connecting the wideband power to the ECU power. Event the link above does it to the 12v ignition supply in the fuseboard.
It would be great if anybody has more info on that matter.
I just found this tutorial and this thread of using the ECU power and ground....
But like goose I would still appreciate some more insight on this if anybody has any.