I picked up one of these
http://pacermarine.co.uk/product/qui...adaptors-gauge recently along with a clam seal
Bit of an impulse buy and seems somewhat large, thought I might be able to stow/hide it with thin bungee cord under the seat
Got the air floor up to 0.9 could've gone a bit more but only just. Has an inline pressure and worked quickly, still a large item in a small boat!