So i brought my truck to the dealer and they told me it was the speed cluster, apparently they go bad on all trailblazers. thatll cost me 600 bucks so screw that. then i brought it to aamco they said it was my speedsensor and gonna charge me 200. so i got the speed sensor for 25 bucks from autozone. replaced it didnt work. did i do something wrong after installing it? or is it a good chance that it is the cluster. Thankyou