Jim,
My experience is that the radio and the tacho are both sensitive to interference
if they run alongside the cables to the mag anywhere. I had just this problem
a few months ago after 'tidying up' the wiring behind my panel.
If they do have to run close - like through the bulkhead, then I suggest it is
better for them to run at 90 degrees to the mag cables to avoid/reduce inducing
current in them, or that one or the other of them is double-screened and the
screen earthed.
That said, its also rather easy [for us amateurs?] to get poor BNC or other
connector
terminations in the screened radio cables themselves as the connections
are a bit tricky to make without specialist and rather costly tools.
I hope that helps somehow
Clive Sutton
G-TAGR
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