W.T.F ?

pishta said

what if you shielded the tach cable with a ground sheath, ie. BX or MC cable. 14/2 would be workable in an automobile app. Its a helical armor wrapped 2 conductor cable. Would not look bad either as its shiny and would provide a nice RFI shield when you ground one end.
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I've brought this up before. shielding for this kind of thing is normally known as a "Faraday shield." You ground it on one end only. One way to do this (in the telco/ data world) is let's say you have some CAT5 and are only using 1 or 2 pair. You tie all the unused pairs together at one end, in this case the MSD box end...away from the distributor and ground ONLY that end. You could scare up some 2 wire shielded cable (They make it, both specialized RF coax and for use in the audio industry, "balanced" microphone cable) Same deal, ground only one end of the shield