Re: Idiot lights to gauges and OMG! I hate that Morse dual control down near the deck
Re: volts better than amps. I think both are needed, but I like amps on the engine panel as it tells you that the alternator is/is not working and volts on the dc distribution panel as it tells you the condition of the batteries.
Also, buzzers are better than idiot lights if they are at a frequency and loud enough to hear.