It reads ( if you look at the top of the guage) in LB/sq" ie pounds per square inch. That means it reads pressure. As it reads up to 150psi (per square inch). Most gauges are designed to read at a nominal mid position - ie 75PSI, I would suggest that it is an oil pressure gauge.
Gaylandererclean your finger nails when you wash your hands.
could it be a air pressure gauge off of a lorry? to measure the out put of the on board air compressor , the hose looks as if it could be
clean your finger nails when you wash your hands.
I was wondering about that tube, as an oil capillary is usually a small copper pipe, coz yu dont want rubber pipe bursting and 7 litres of hot engine oil being pumped into yo cab at 50PSI![]()
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But what ever it is used for - it was designed to measure pressure of up to 150PSI.