The BRAVO GE BTP 12V Pump has something of a cult following.
Sure there are cheaper, but there aren't better.
This is the very latest version direct from Scoprega Bravo in Italy and in UK stock now.
The pump clamps directly to a 12V battery or connects via a 12V socket.
It offers a two stage system and the gauge allows you to set the final pressure for quick and exhaustion free inflation of pretty much all inflatable items.
Comes with hose, various fittings and carry bag.