Twisted wires and ferrite cores help enough innthe industrial world that we use the a lot to prevent cross talk on our control wires and circuits. Having one end of a sheilded cable grounded also helps plenty. If the tranducer cable has a sheild the head unit should have it grounded already from the factory. A fella could use a Dc to Dc converter. Run 24 volts to the converter step down will step it down to 12 volts and should clean it up also.