On Nov 19, 7:40 pm, fred wrote:
Since I can not hear most warning horns (old ears) I would like to
have a stick vibrator, ( maybe that is off the shelf) a big flashing
light or an explosion. My wallet hurts, and teaching USTALL doesn't
seem to work.

If you want a light, just hook up a panel mounted 12 volt LED
(available for a couple bucks at any electronics store) in parallel to
your horn. That way you have both a horn and a light.