Found the sensor following Clan's directions! really tucked away down there, ordered a new Sensor and fitted it £40 from ebay now readings for desired and actual Boost presure are nearly exactly the same and rise and fall in sync. No alarms to date.
The old one was always 150 - 175 hpa above the desired value, even at tickover, so it seems they do fail by reading higher than the true value. So far so good and great direction from Clan.
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