For anyone else looking for information, I have been informed by the UK Rotax service agent, that the Rotax part number for the plug alone is : 881302.
It is also available from non-Rotax sources with a cable already attached
It is made by SSI Technologies Inc and is called a Packard connector
DigiKey distribute them as follows:
http://tinyurl.com/oxq3m2f
http://tinyurl.com/qz3upvn
If anyone has a photograph or a link to an inline adapter for the pressure sensor to fit into, I am still chasing this part.
Mark.
Connector.jpg (You do not have access to download this file.)