Speedometer: Digital or analogue indicator placed on the dashboard that shows the speed of the car.
An iron cable or an electrical sensor monitors the rotation speed of one of the wheels (usually the front one) and, through a mechanism or certain mathematical calculations that take place in the ECU, the moving speed of the car is shown in the speedometer, which may be analogue or digital.
Bought the truck used, it ran fine for bout a year then transmission starts acting strange. Wouldnt shift out of second gear, troublecode po967, low voltage shift solenoid b. I changed that still no imporovement. Changed ignition switch cuz everyone was saying it had a voltage drop at the switch, still didnt fix it. I found a bad ground wire so i fixed that, kind of improved but now the speedometer doesnt work sometimes and when it isnt working it wont shift out of second gear. But when it is working i have to shift manually for it to work correctly other wise when taking off from a stop it will start off in 3rd gear. Troublecode still only shows p0967. One other thing aotomatic door locks dont work