You can change the gauge as Terry describes, but before you turn on the ignition switch, you either have to run a ground to the panel, or else re-install the panel back in place. The best solution is to make up a short wire permanently installed form the dash to the panel.
When installing the gauge, the spide harness (power) goes to the non-ribbed connector of the gauge. The sending unit wire will be ribbed, and goes to the ribbed connector of the gauge. Make sure the retaining bracket is solidly onto the gauge as that is where the gauge gets it's ground.
That little allen key on the back of the alternator is where you can adjust a tiny potentiometer to adjust the alternator's output voltage, should it be too high or low. Some of the alternators (the prestolite AU20003 model if memory serves) also have a terminal inside where you can change the output from 60 amps to 30 amps if you are in hot climates.
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