Have one of these on the way from the States along with a 0-30 PSI one.barneey wrote:http://www.ebay.co.uk/itm/371059690273
Is the ones I bought and are so far leak free.
IIRC most gauges work on an internal spring so if the pressure is greater it will still supply the greater pressure but might not do the spring much good in the long run, I have never found the need to go above 15psi though for the style of beer I like to use.

How easy was it to take the end off the manifold and what did you use to ensure a proper seal when adding the guage (locktite and if so which one?)?
PS your photo seems to have disappeared, which is a shame as it is a very cool idea that I had not seen before.