Also too, if you do decide to keep the factory amp gauge, remove the cluster and clean all of the connections GOOD. On mine, it is held in with little speed nuts. They also give it the electrical connection. I recently removed mine to repaint the plastic housing and put LEDs where the two instrument lights go. I noticed some white corrosion around the nuts that hold the amp gauge in, so I removed the gauge, cleaned everything up good and put it back together. Make sure the nuts are tight, but you don't have to be Superman. They were almost finger tight when I removed them, so it needed attention.
