For disassembly, the welt brackets are bent and carefully removed with glass and frame. Unscrew the screws securing the speedometer scale, and then unscrew the two screws securing the speedometer from the back of the instrument cluster and remove it. Now, by unscrewing the nuts securing the instruments to the printed circuit board, you can remove the coolant temperature and fuel gauges.
The assembly of the instrument cluster is carried out in the reverse order.