Mr Fawlty replied:

Ok... the jerk may have been the cable that opens the throttle on the cruise snapping, I had this happen & fixed it myself. No Speedo??? Have you checked every fuse including the ones near the accelorator and the ones in the fuse box in the engine bay?
Yep you would be right - if you can't identify and rectify yourself you are at the mercy of a holden Dealer......

Member - George S (QLD) replied:

Thanks Mr Fawlty,

I ve tried all the fuses n then thought if it was that easy there would be no jacks running arround with hi kls on the clock.
so looks like im off to Ultra Tune to get ripped ( The Warrant thier work not like Holden )

Thanks
george