Clayton,
I have been using Autometer gages for the past 20 years, on trucks, cars, sandrails and racecars. They are the finist instruments money can by. I have all Autometer gages, the Ultra Lite series, no it is not normal for the needle to shake, any time. Autometer has a warranty for the life of the gage, just give them a call. They will mostlikely want you to ship it back to them, so be prepared, but they will get the problem fixed.