These were probably for gauges which measured the level of propane in the tanks, and sent a reading to the overhead display panel inside the front of the trailer. They were fitted to my trailer, but the system is obsolete, and, with modern change-over automatic regulators with red/green indicators, they are unnecessary IMHO.
Nick.
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Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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