Originally posted by GR8SVT:
For example: If I drive up to 65 mph (OBDII) and the speedo reads 75, would I just adjust the needle to 65 mph while moving? Or is there a way to do it while stopped - in a garage sort of speak?
Thanks! 
There is no way (and need) to adjust the needle - the circuit turns it (tries to) a given angle corresponding to your speed. So if it was at zero when you started, it'll read correct.
What usually the problem is that when you put back the needle, you might've pushed the needle to the pin too strongly (very easy to do) and too much effort is needed to turn it (i.e. sticks)
Try disassemble it and put it back gently.
Typical symptom of this problem is that the needle is 'jumping': doesn't move gradually, but it stays let's say at 20 and when you increase speed suddenly jumps to 30 or so.
Tiv
