It is most likely a broken wire or a wire unplugged.  The oil pressure
sensor that makes the buzzer turn on is by the water pump.  Most of the
time the wire gets knocked loose by the belt of the water pump or someone
bumping it or just forgetting to hook it up when they are installing the
engine.  If it is plugged in then you need to check for continuity and also
be sure the sensor is a grey one.  Finally if all of that checks out it is
time to get the oil pressure gauge out and test it for real to see if there
is a real issue.

Ken

On Wed, Apr 6, 2016 at 5:12 PM, Grant Johnson <smiley.grant@gmail.com>
wrote:

> Hey everyone, just had a rebuilt 2.2 installed in my 88 Syncro and the oil
> buzzer goes off as soon as the motor warms up,and stays on no matter what
> the rpms are, etc.... The buzzer would go off at random with the old motor
> in the van but I attributed it to an old worn out motor. Electrical is a
> really weak area for me, so I'm fishing for any suggestions you guys can
> give. Thanks
>

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com