I've noticed lately that my tach won't register but a little past 2000 rpm. When it idles it sits on 900rpm which is correct as far as I know. I compared it to another '69 Z28 the other day and noticed that the needle on it was straight with the center of the tach. Mine wasn't. My needle seems to be off center. Has anyone had this problem where you can tell me what I need to do? I didn't know if it can be corrected without removing the tach or if it has to be removed and sent off for repairs? I've never removed the tach, so in case I have to remove it can someone please tell exactly what all has to be done? Thanks, Donnie.