Do a search this has been covered heaps of times. Some things work others don't so just get an Oz or UK one and save the hassle. It's easy to swap out the UK mph speedo with the Oz kms one as well. The UK ones are straight plug and play.
im very interested my gx could do with a rpm counter its a 1.3 gx and i know i more than red line it any one have one for sale with instructions to fit possibly si model maybe ??????