AU2 Forte, continous beep when ignition on!

[HypnoTECH03]

hey guys,

for the last week my AU2 had been running like a bucket of fart. & a bit of an oil leak (looks like its coming from the seal behind the harmonic balancer)

when you put your foot down it'll lose power & by the sounds of it drop a cylinder.. so running on 5 cylinders under power.
i pulled out the air box, all airflow tubing, throttle body, spark plugs, ignition leads, pulled out the Injectors, radiator fan, & radiator, drained the oil & coolant, checked everything & all worked fine.

ended up putting it all back together and before puting the airflow back on i turned the ignition and im getting a continous beep coming from up under the dash.

http://www.youtube.com/watch?v=7_DzVQeN_WU

and also the oil leak is now worse, i've sprayed degreaser & hosed or the bottom of the engine to see where the oil is coming from an looks like its soming from behind the harmonic balancer..

the car runs and sounds fine now, just the dash isnt working properly, & a large oil leak

Help Please!!!

CHeers

Ashley