Pressure Gauge on Bottle Jack

How does one go about putting a gauge on a bottle jack. Or, where can a bottle jack with gauge be purchased. Here's a photo -
http://www.granthams.com/jack/BottleJack.jpg
Any suggestions are appreciated.
Thanks
Rod
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I put a 10,000 PSI gauge on one of these: http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200333511_200333511 and bought a few spare connectors for modifying second-hand jacks and cylinders. One big advantage is that the cylinder has no right-side-up so it works well downwards in a press frame. You can make a tensile strength tester with a pull-back cylinder.
Jim Wilkins
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chips-'n-swarf wrote:

When fitted a pressure gauge will register the fluid pressure, which may not be the pressure exertedby the ram. for example, 100 psi on a 10 sq in ram will give you 1000 lbs lifting/ pushing energy,not 100 lbs. so youll need to make some calculations to relate pressure to lifting ability of your setup.
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You will also need to allow for the friction in the seals. You may think it will be negligible for lubricated rubber, but it won't. ISTR the actual force might be 20% lower than the calculated.
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