BMW E32 instrument cluster faults
Why does the E32 instrument cluster act up or the gauges swing?
The most common cause is worn capacitors in the cluster. Symptoms are swinging or dead gauges, and a speedometer and tachometer that do not work, especially when cold. Cracked solder joints on the circuit board and burnt gauge bulbs or a fuse can cause similar symptoms.
Why does the E32 instrument cluster go dark or switch off while driving?
The cause can be the connector behind the cluster, which comes loose easily: then the gauges and the Check Control (warning system) do not work, but the indicator lights stay on. Other causes are a worn ignition switch base and a loose solder joint on the cluster circuit board. Check the connector and the fuses first.
What kind of capacitors should you choose for the cluster?
The voltage rating must be at least the original, and 40 V is a safe choice. The capacitance must not be lower than the original. For the VDO cluster, the general guideline given is 3 pcs of 220 uF 40 V and 2 pcs of 20 uF 40 V. The replacement is done by soldering, with the parts the right way round.