Thanks everyone for the input. I'm not sure which way to go at the moment I
think I may try measuring the pressure in the Air tank since I have most of
the parts for this handy. I guess I would also like to try some of the other
options (I really like the Perspex rod stuff). Also did anyone see the
article I saw with the capacitance method in it. I think it may have been on
Circuit Cellar (or possible Elektor), anyone any experience of using this?

Andy

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