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have a look on this web page,http://weather.lgfl.org.uk/Default.aspx find your nearest station, this will be your pressure, then put in your height and the pressure on your station, from memory that how colin told me to do it, to be honest i dont think the pressure needs to be that accurate, you calibrate your carb/engine to the settings that you input on the software, as long as you use the same weather station all the time, it will show a rise and fall relative to the actual conditions, and the software will compensate to the amount of this rise and fall, well thats how i see it i am sure John will correct me if i am wrong?
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