Passing parameters thru a Timer Eventhandler

I need to pass a custom parameter thru to the Timer.Tick event handler. I have used the EventHandler<TEventArg> but I get a type mismatch between the System.EventHandler and my derived TEventArg.

    public class telemetryEventArgs : EventArgs
    {
        MyVehicle _v;

        public telemetryEventArgs(MyVehicle vehicle)
        {
            v = vehicle;
        }
        public MyVehicle v
        {
            get { return _v; }
            set { _v = value; }
        }
    }


timeTelemetry.Tick += new EventHandler<TimeSpanEventArgs>(timeTelemetry_Tick);

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