The Speedo and rev counter cluster keep resetting and dropping to zero, the ABS, ASR and hand brake light come on, then the whole lot returns to normal. This happens when driving and when idle. Any ideas?
speedo signal is derived from ABS. So if the ABS computer / sensors are playing up, which seems to be indicated by abs, asr and handbrake signals, speedometer will also fail.
Is the brake fluid level ok ?
You have a bad battery connection.
Tighten your battery connectors, and see if that will help. If not your battery cable might or earth might be broken.
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