Amp meter reading backwards

You can pull out the cluster pretty easily and see if the wires are backwards the red side is marked with a big R! If that post has the red wire then you know the problem is something else. If its reversed you can fix it while you're there. To pull the cluster simply loosen the the two nuts that hold up the steering column, not all the way just enough to lower it to clear the cluster. Then take put the 6 screws the hold the cluster in. Reach in and pop the speedo cable loose and the cluster will slide out far enough to inspect the wiring without removing anything else.