On the MG I have standard relays and they are virtually silent, however the warning lights are directly in front so impossible to miss.
On the Morgan I have an electronic relay, and the warning light is out of my normal vision range so I have a buzzer. It comes on after about 10 secs or so, but the brake pedal silences it. Quite useful, as I often found I was leaving the indicator on, especially when changing lanes.
Plan to upgrade both to LEDs this year, four bulbs and two relays are about £60 from classic car leds.
