Dodge Neon year 2000 that has a speedometer problem

I have a Dodge Neon year 2000 that has a speedometer problem I need help when I reset the speedometer it will go to the four needle positions it's supposed to the needles move how they should as soon as I start the car the tachometer goes to the one and then it drops back down to zero none of the other gauges except for the gas gauge is working and then after about 10 seconds of the car idling the check engine light comes on there are no visible codes when I plug in my OBD2 reader what do i doI have also checked all of my fuses and relays which appear to be fine