Stewarts has an impressive range within this product area which includes pressure gauges, differential pressure gauges and sub sea pressure gauges.
We cover pressure ranges from vacuum to 3500bar.
Housing dimensions from 50mm to 250mm.
The product range also includes chemical seals.
The equipment has a good range of accessories that are adapted for applications with high vibrations and high peak pressures.
These include check valves, overrange gauge protectors, snubbers and vibra gauges.   The products have been used for many years for both offshore and onshore installations in Norway, and have a significant reference list both nationally and internationally. Source.
more info about subsea manometer pressure gauge with compensating membrane with lower weight and cost here .