i have the chance to get a t reg octy 1.9 sdi for

The wiper problem is porbably a siezed mechanism which can be taken apart and re-greased

The speedo may need a new cluster which will need reprogramming cos the immobilser is tied into the cluster not a major job if you can get hold of vag com

A new instrument cluster could be

You really need to find out what the problem is with the speedo, it could be anything from the speed sender to the cluster.

No but the cluster is expensive, at somewhere between