Seen a tons of people on here with the same problem I had. ABS/ Brake light on...speedo acting funny. I don't drive the truck too often anymore as I have a company vehicle, but I took a short day on tuesday to go home and screw around with it.

The ABS/speed sensor on the rear pumpkin was the issue. Very simple fix. $35 at the local Napa for the speed sensor, and about 20 minutes of labor. 1/2" Wrench...and I believe a 9/16" wrench...and a flat head screwdriver.

Weird angle, but simply use the 1/2" wrench to remove the first bolt that holds the abs lines in place... then remove the 2nd bolt with the bigger wrench. Pry up/pull the sensor out...drop the one in. Plug it in... All the lights are gone...speedo is back to perfection.

 

I am saving this one for when I need just this advice. Thanks.

 

Just be gentle when you pry it out, mine seemed like it wanted to shatter so I was very very careful.