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South Australia | Topcon use semmler gauge savers and a VDO oil pressure sensor. the gauge saver is basically a condom filled with oil. Water presses against the condom and pushes the oil harder against the oil pressure sensor causing a different amount of resistance which gives a pressure read out. I have also seen these units just plugged in to a normal oil sensor and oil pressure gauge. All it requires is one wire ran into the cab to the gauge. Think the pressure sensors are around AU$40 and the gauge saver (316 body with viton sack) AU$128.
http://www.semmler.com.au/gauge.php
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Reliability of electronic sending units for pressure sensing of sprayer booms?
