how to mount a speed sensor on a slash 4x4

hi i just got the dx3s and i got it with telemetry and i want to put a speed sensor and i need help to find a way to mount it. Please help me!!!!!!

please provide information, like what speed sensor etc, if you want us to take time to respond take time in your question..not being a dick just being honest

Like jeremy said.....Or follow the directions that come with the sensor.