i recently changed my speedo cluster globes and when i put it all back together everything was cool, then when i switched my car on the kmp/h reading was sitting at 20 and the revs wer at 1500, when usually its at 0 kmp'h and 500 rpm, i took the clear cover off and tryed to push it down with my finger but it would not cooperate and flick back to the unnormal position......any ideas before i get ripped off by a autoelectrician?