do you mean engine won't turn over ???if so remove small loom on gear box .rev lights ,neutral switch ,and it plugs in to the a plug at the chassis ,,no need to touch tacho ....wires are known to rub through on the conduit ..gives wires a good tug and one or more will probably break ..only 4 wires in loom ...also check neutral switch on top rear of box is working ..may have an intermittant fault ...is starter ok ..also check fuse at rear of battery carrier as it rots ...
norb
February 2011