For $400CDN BBA should be doing alot of work to your cluster.
For $349US Modulemasters does the following for a MK1 TT Cluster:
This quality repair service includes the following work performed to your quality VDO instrument cluster:
* Restoration of BOTH the speedometer and tachometer stepper motor system (even if only one gauge is problematic)
* Restoration of fuel and temperature gauges and their related firmware
* New CAN gateway processor chip loaded with latest generation firmware + 5 year guarantee
* Our proprietary plug and play firmware add-on (Smart Set) for immobilizer III (3) systems inside your cluster
* Brand NEW center information LCD with long life metal alloy technology vs printed ink
* Full power up and test of the instrument cluster before and after restoration
* 5 year warranty on new CPU and software. LCD has lifetime guarantee
TT Cluster is 2nd in the list on this link:
ModuleMaster | Services | Instrument Clusters