It's not possible (ok, everything is possible, depends on your budget ) to install a R32 Cluster (1J5 920 8x6 xx) on a '99 Golf with a non CAN-Bus Cluster.
Some Signals were expected on the CAN-Bus by the new Cluster, but the old Golf sends them on addidtional wires..
Schrumpft mein Penis jetzt, weil mein Golf mehr als 100PS hat?
I know it is possible. There is some kind of canbus emulator and two wires that have to be switched around. But exactly what wires and where to find the emulator i don't know. There have been some on ebay a couple of years ago to around 80euro.