After replacing the sensor, the ABS light comes on, the speedo starts fluctuating and not working, and the O/D light flashes at 60MPH consistently. I've checked the connections and the wires and they are in good condition leading in to the sensor. Any help would be greatly appreciated. The trans is an automatic. Thanks.

 

Which sensor did you replace? I had to replace every sensor to get ABS light to turn off. It's a long story but can be read about in speedo problem thread.

 

I replaced the abs speed sensor on top of the rear axle