Got a merc 4.3lxgen+<br />Engine was not starting when warm. Relaced coil, cap, rotor and ignition sensor to make sure. Working like a dream. New tachometer was working prior to above works. Now registers at 800 to 1000 constant even when engine off! Any ideas?<br />All wires replaced as was (I think) apart from black cable on new sensor (old one didn't have one). Connected black cable to engine block using connected ring thing.
