Richard
In the case of the Dingo, or any other similar transmission of a signal over a long length of tube, I'll agree. But in the case of the usual 2 foot length of tubing as used on normal vehicles, It is not a great consideration.
I had an interesting experience with the plastic tubing for an oil gauge which I would like to relate. It was on a M38 Jeep that had been converted to 12 volt. I was driving it when suddenly I had a bunch of smoke and the oil gauge reading zero. I immediately shut off the vehicle and opened the hood. The oil line had somehow contacted with the exhaust manifold and melted open. It then melted shut. I was able to continue on my way. I'll never use the plastic stuff again.
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