just ordered this yamaha digital air pressure gauge at £4.99 including post and packaging "me thinks" it's a decent buy. it's a yamaha geniune accessory so should be a quality item. just thought I would share this information with you guy's :)
http://www.ebay.co.uk/itm/220887552786?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649