all cars are different, the b16 i had in my car was properly balanced, had the EXACT same compression on all cylinders and motor mounts were in perfect condition, the new zc i put in does not move at all in the car, u can turn it on and look at the engine in the bay and it stays perfectly still and i have not yet touched it straight from japan, so....???? just depends on the engine, as for the needle shaking that may be an ignition system issue, ie cap and rotor, spark plugs etc. but on a new car should all be fine still..,.