Manually separate the steering wheel trim cover.
Disconnect the horn connector.
Loosen the steering wheel mounting nut.
Remove the steering wheel.
Instrument cluster mounting for vehicles produced since January 1988: 1 - instrument cluster; 2 - mounting screw; 3 - protective strip
Loosen the instrument cluster mounting screws.
Instrument cluster mounting screw
Disconnect the speedometer drive flexible shaft from the transmission.
Pull the instrument cluster forward.
Disconnect the speedometer drive flexible shaft from the socket in the instrument cluster.
Disconnect the instrument cluster electrical connectors.
Disconnect the vacuum tube from the economizer.
Remove the instrument cluster.
Removal the instrument cluster
Install the instrument cluster in the reverse order of removal.
Instrument panel of cars produced since January 1988: 1 - plastic plug; 2 - lower supports; 3 - instrument panel; 4 - front shield
Since January 1988, a new instrument cluster has been installed on the Audi "100" and "Avant". As a result, the removal and installation of the instrument cluster should be carried out as follows:
- disconnect the wire from the negative terminal of the battery;
- remove the steering wheel;
- unscrew the bolt securing the steering column switch and remove the switch;
- remove the instrument cluster mounting bar;
- unscrew screw 2 (see picture) instrument cluster mounts;
- remove the instrument cluster, disconnect the plug connectors and disconnect the speedometer drive flexible shaft;
- install the instrument cluster in the reverse order of removal.
Marking of the terminals of the instrument cluster voltage stabilizer: 1 - "input" +12 V; 2 - "mass"; 3 - "output" +10 V
Rear view of the instrument cluster: 1 - board of control lamps for brake fluid level and coolant temperature; 2 - voltage stabilizer
(Information obtained from this resource: Audimanual.ru)