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Whilst I know that there is a good thread related to fixing S4 Speedo's & Tachos that read the wrong value & need calibrating. Is there anyone out there with info on / schematic of the Speedo & Tacho to help fix intermittant working.

My Speedo works 90% of the time - when it doesnt it just reads zero.
My Tacho works 60% of the time - when it doesnt work it either just reads zero or it goes wildly up & down.
The 2 faults are never linked.

This says to me that there is a dry joint or bad connection somewhere.

Already checked the connectors on the rear - they are fine.
 
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