Speedometer, Tachometer, and Odometer not working

I have a 98 Tacoma that the speedometer, tachometer and odometer have quit working. It started last year in the fall. I noticed that it would work in cooler temperatures which led me believe it to be a electrical problem. The check engine light came on and I went in to Auto Zone and they told me the error code was p500 and that it was a speed sensor. I bought one over the internet but did not put it on. The weather turned cold and it worked fine, check engine light went off. As spring came this year the weather turned warm and everything started acting up again, so I replaced the sensor on the transmission. Nothing changed, it continued to come on and off and now has not come on today. I went back up to Auto Zone and the same error code P500. When I look around at parts I'm seeing a wheel speed sensor. Is this for a 98? What am I missing? Please Help.