I learned that when I worked for Bill Elliott. We always had 2 boxes (reg & backup) mounted on the floorboard to Bill's right. After that, I always put them inside of my vehicles, too. There are shielded sleeves for the wires that will prevent the signal from leaking over to the ECM wires.
Below is a pic of my race Buick with the Crane Hi-6 mounted on the aluminum dash:
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