Putting the displays near each other should be an issue, you just have to make sure you're not running the 2 sets of cables parallel to each other. The interference primarily comes from the 12V power in the break controller bleeding into the the signal cables for the Gryphon. LCD displays themselves are immune to EFI, it's only their cables that are sensitive so as long as you run the cables in 2 different paths you should be okay.
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2007 F150 Screw 5.4L FX4
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