running code in an Xterra is quite the expierance.
I run a dashmeiser and have a Grover Stuttertone air horn
If you got the cheap Galls one that has the on/off switch mounted in the box, return it. Buy a real setup that has a remote switch, then you can do something like I have:
http://www.globalsoftware-inc.com/coolerman/CoolKit3InstallPage.htm with the flasher mounted under the hood, there is plenty of room on the right side fender beside the cruise control box. I personally have 6 relays and 2 fuse panels there.
Ramness has strobes in his heads/tails.... looks good.