Some do have shielding, and there's also a dependance on the resistance of the conductor as well. I don't recall off the top of my head which, but once I revisit this area I can post. I just kept a mental note that it was required, though it's possible I could be wrong on that. Certainly two I know of are crank & cam sensors. Guess that might be only an issue if you mount the CD box inside...
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1971 Lemans Sport 461 bottle fed daily driver
1971 Trans Am 474 blown EFI pro tour car
1972 442 W-30 clone
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