I have a 1999 Dodge Ram 1500 4x4 5.2 liter. The ABS light stays on along with the Brake light. The speedometer stopped working along with the odometer and cruise control. I think it would be the ABS speed sensor on the rear differential, but I am not positive. Any help would be greatly appreciated. Thanks

 

Speed sensor would be a great place to start. as where its losing input to the spedo.

 

I'm not sure about the newer models but on the first generation trucks the abs system runs on the same fuse as the tack and speedo so try checking your fuses and relays.

 

Yea i'm positive of it being the speedsensor, mine did the same thing an all i had to do was change it out..