yesterday I installed an additional horn in my '82 westy.

The original horn produced a meep-meep type of tone that sounded like
Noddy's little car. For a few years I had a Fiamm air horn setup installed
without a relay -  a bit much for the stock wiring - took a second to make
enough air to really parp the horn, but then the horns failed and I was back
to the meep-meep.

I picked up a dual Fiamm "Tipo 80" electric horn setup from an Audi 5000.
When I got it back home I realized that only one of the units (snailshell
shaped) was working, so I combined the meep original horn with the new Faimm
baritone and I'll be damned if it doesn't sound great. They are wired in
parallel, again with no relay. I found that they worked best if all of the
connections were clean and tight and the horn contacts in the steering wheel
were sanded.

Alistair