I've come across some decent looking battery charge meters from Kelly:
I would get a lower voltage one and use fixed and variable resistors to adjust for your battery, that way the meter can be used on future projects of different voltages. For controllers with a speed signal, such as on many electric scooters, it may be possible to by-pass a resistor inside the meter to make the 24-volt one accept 12 volts, and then you'd have a speedometer of sorts.
As for lights, particularly on electric scooters where there's more room to work with, try
I've found their drop-in replacement bulbs to be excellent in quality, and the new 5 watt MR16 tracklighting bulb rivals small HID lamps and 20-watt halogen tracklighting bulbs. Installing on electric scooters is easy enough - the housing is already there usually, just replace the bulb socket and use metal pipe strapping to screw the new socket into place. The pipe strapping should be bent to press the bulb against the headlight cover, maybe with rubber or foam between. Would be good for bicycles too - my 3-watt from a couple years ago is great, can't wait to try the 5-watt!