Hello Ian,
it is unclear from scripting documentation:

Can function onSensorRead be defined several times, with different sensor argument in each?

onSensorRead = function(mySensor1) { do something;};
onSensorRead = function(mySensor2) { do something different;};

or is sensor argument the parameter, that is set by Torque and can be accessed in function body?

onSensorRead = function(sensorArg) { 
    if (sensorArg = mySensor1) {
        do something;
    } else if (sensorArg = mySensor2) {
        do something different;
    };
};