Firstly I have an ABS fault and upon checking for errors it comes up with both rear sensors, is there a common problem with corrosion on the exciter rings

Secondly I have done a temporary repair with my speedo wiring where I have wired from the speedo sensor (gearbox) down to fuse 27/8 for engine management/immo can someone direct me as to where there may be a common earth or a common place where the wire breaks

Many thanks in advance

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