Oliver
Thanks for reply.
Gauge: Please confirm that you are thinking: Disconnect but leave old wire in place and thread new wire through - outside of loom etc? If so, do you have any tips on its route? Also is this a special Audi wire or can it be made up?
I managed to get some used gauges but, as everyone said, the gauge wasn't the problem.
Diff Lock: Very good news. Vac Pipe end under back seat was split. Cut off bad end and all now working, including both warning lights on switch and ABS warning on dash.
As always, sincere thanks to you and everyone else for help and, in particular, for diagnosing the Diff Lock pipe as the likely problem.
Keith
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