Chrysler Repair: 95 Dodge Neon Speedometer inaccurate, speedo needle, calibration techniques

Question
I have a 1995 Dodge Neon and it seems that everything on the dash right now works except that my Speedometer goes up to 50 as soon as i put the key in, and when im driving it basically starts at 50mph. so once i hit what i believe is 60 mph (aka 120 on speedo) because that is as far as it goes im not sure how fast im going. So my question is, is there a reason for this because I had resodered all 20 points on the back, a few actually were a little cracked and it seems to me that the speedo is still starting off at 50.
Thank you so much for your help. I hope you can figure this out. Crossing my fingers! :P

Thanks again

Answer
Hi Brian,
The '96 manual doesn't offer any calibration techniques. It simply says that logic built-in to the cluster interprets the pulse rate from the transmission speed sensor. I doubt there is a calibration self-test, but you could try: if there is a trip odometer press the trip reset and hold it, while the ignition is off, and watch to see if anything interesting happens. That is how later model clusters are calibrated, but I really doubt there is any fix other than going into the cluster and locating the circuit that turns pulses into voltage to drive the speedo needle. Check too to see if it might be spring-loaded as in the mechanical speedos as a means of setting up '0', or even try rotating the needle while gently restraining the shaft which it is attached to. Please let me know if you learn something helpful.
Roland