Using a Tachometer with a engine sensor

Hi Dave

All it says on all drawings is Stop magnet for the stop. 
I have 2 wires coming from the sensor to the old Tachometer. Will both wire be connected to the new tachometer? I ask since i know from the fishing boat that there are only one wire going from the alternator to the tachometer there. It's just so i know how to connect all this again:-)

Will go offshore later today, so are a bit on/off here, since i will be working nights out there. But will answer during the evening/night.

Regards
Tommy

Hi Tommy
The wiring for the sensor is normally [ live in - body negative - sensor output ] so two wires.
You should find that you have a wire coming from the ignition switch to the sensor and one from the sensor to the tachometer. The output is normally 5v high / low logic flat pulse. The tachometer counts the changes in state. You will still need to follow the tachometer tuning instructions to set it up.