[TR] Fiamm/Hella air horns on TR4-TR6

[Alain]

Is anyone using a Fiamm/Hella AIR horn setup on their car??

If so, how do they like it over time??

Also, since the Fiamm or Hella air horn set up only has one electric
mechanism -- how does one wire it in?

Put another way, what does one do with the other horn circuit that will be
blank??

Thanks for to all the EE and Air horn users out there in advance,

Alain