amp gauge troubles

On a cruise the other night I noticed my lites were dim and I found one of the high beam plugs unplugged so with the engine running and the lites on I reached in and plugged the socket back into the head lite bulb.The bulb lit right up but then I noticed my amp meter was pointing dead south!! The gauge seems to work moving when I rev the motor but it's pointing at 6 0'clock instead of 12 o'clock.Is the lite and 6 o'clock reading connected ? Cluster was rebuilt 1 year ago with new circuit board. Any tricks to pop the needle back to the 12 o'clock position? I'm stumped. thanks Nick

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