I would not recommend replacing the gauges until the sensors sending the signals have been tested first.
As far as the speedometer problem goes, I would check the vehicle speed sensor out first. The sensor is located on the right side of the transmission case just ahead of the rear propeller shaft:
Remove the sensor and check for damage to the driven gear and check for play in the gear shaft. This may cause your speedometer to jump like it does. The best way to check this sensor electrically is to connect a scantool and see if the speed signal is hopping around as well. If the gauge gets a bad signal, it will show a bad signal.
A scantool is a tool that mechanics use to read data that is sent to the computer. It connects to the data connector under the hood and reads information from the computer. If you don't have access to a scantool, you can disconnect the connector at the speed sensor and probe the sensor with a multimeter set on AC voltage. Drive the vehicle and see if the voltage produced by the sensor fluctuates. If it does, the sensor is bad.
As far as reflashing the computer, you can't do this yourself. You will either need to take the truck to the dealership or find a shop that has the equipment that can do this for you.
ABS & Brake lights warning indicator steady on dash and speedometer not working for Dodge Ram?
http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html
Warning lights on and speedometer died?
http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html
As far as the speedometer problem goes, I would check the vehicle speed sensor out first. The sensor is located on the right side of the transmission case just ahead of the rear propeller shaft:
Remove the sensor and check for damage to the driven gear and check for play in the gear shaft. This may cause your speedometer to jump like it does. The best way to check this sensor electrically is to connect a scantool and see if the speed signal is hopping around as well. If the gauge gets a bad signal, it will show a bad signal.
As far as reflashing the computer, you can't do this yourself. You will either need to take the truck to the dealership or find a shop that has the equipment that can do this for you.
This details will help.
See below list of related solutions :-------
ABS & Brake lights warning indicator steady on dash and speedometer not working for Dodge Ram?
http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.htmlHow to trouble shoot speedometer?
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
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