Question: I recently changed the battery on my 2003 dodge dakota with the 3.9L engine. Upon starting the vehicle, the speedo and tach needles both jumped all the way up. the tach needle came back down and is working fine, but the speedo needle stayed stuck at the 120mph mark. Do i have to reset something? or did I do something wrong?

Answer: With the ignition turned off, simply press and hold the trip button at the bottom of the speedometer for 10 seconds. You will see some
numbers flash on the odometer as the system resets. The needle should
go back to normal after that. I have heard of some mechanics charging a lot of money to press a little button, since most people are clueless about this reset trick.