Installed Autometer gauges yesterday. Volt meter is bouncing around between 16 & 18 volts. I know alternator, battery and regulator are good. What else could be the problem? Could not possibly be in the way I wired it could it. Ground is hooked up to a good ground with the three other gauges and the voltage is coming from the ignition blade on fuse block. Basically daisy chained from one gauge to the next for ground and power. Why is the voltmeter reading so high?