Air Horns as alarm siren

How would i connect my set of air horns to go off when my alarm triggers. Right now i have them set up to go off with a horn switch through a relay. i was going to just tap into the siren wire but wouldn't that just make the air horns go off constant not pulse. i want them to pulse. i have the valet 554r alarm. could i possibly connect the air horns to the orange wire on the primary harness? any suggestions would be appreciated

You can program the siren output to pulse, but you may need a bitwriter to do it. Check the install manual and look for siren constant or pulse option.Certified Security Specialist

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how would i go about hooking up the air horns, just tap into the siren output and i looked and i saw no switch for constant or pulse in the manual, would it be easier to just hook up a flasher to the air horns?