It is plugged into the loom and it is plugged with hose - ever since it's been disconnected (either from the loom or pneumatically) I've had the check engine light. I've reset the ECU many a time .. it continually throws an error code.
It is the changeover solenoid giving the error - I've had it on SW's Garmin diagnostic computer.
Anyone got a spare I could borrow?

By the way the ECU can tell when it's not plugged in .. stick 20 ohm of resistance on it and it goes away until you drive it and it doesn't see a variance in pressure (the solenoid is there to change the MAP over from atmospheric pressure to manifold pressure once the engine is running)