Speedo Sensor

I have a 2003 accord with a bad speedo sensor.The dealer has ordered a new one. The tech says the clip on the old one is broken so he's going to replace it. He pushed the old one back on and the speedo worked and the check engine light went off...well the light came back on and the speedo isn't working again. can someone tell me where this sensor is located so i can try and push it back on again. I looked around and don't see anything hanging. I tried a couple other forums and either no one knows where it is or they don't want to tell me...thanks