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Generator indicator lamp supplies current to the rotor to start the magnetic field to produce current. Burn out the bulb and the alternator won't work. Hi BeamLo BeamAlternator Oil PressureNeutralI'd dump Lo Beam to get back to 4 lamps.
I used that dash plate with Motogadget gauges and cups on my G5 build. It fits and works well, but I ended up going back to the stock T3 gauges and mounts. I thought they looked better. The idiot light lenses in the stock top plate are very fiddly.
The bulb will tell you if the alternator is working. The resistor will not.