Vibration and Sound measurement through LCD

Thanks. Is there a way to make it work to measure vibration though? I got it to measure it (or at least I think it does when comparing to a meter) but the numbers jump around. I have limited time left, so it'd be great if it would work out to measure vibration somewhat accurately. Accelerometers will definitely work, but for this project, I am limited to that sensor. Is there any way I can do that?