Well this isn't on my yota, its on my huge 2000 Chevy 3500 crew cab long bed. So it has it's stock "dont hurt me" high pitched horn. What kinda truck has a baby car horn? So I got an air horn on it. But then i thought: wouldnt it be cool to honk at someone with the wimpy horn, and wen they dont move, blow the air horn at them. So thats exactly what i set up. Right behind the gear shift on one of the vacant panels, i installed an on-off-on toggle switch. now i can use either on my horns whenever i please. WHAT I AM GOING TO DO TO MY 4RUNNER: im just going to take off its toyota horn and find someplace to mount the horns and air compressor. theres no room under the hood, so i will have to find a place.