bwahahahhahahahahahahahahaha! Finally, the stars aligned and I got out under the shade tree for a few hours and installed my electric air horn. note the placement in the pic. the horn is a Code 3 bought off ebay for 40 bux. Its about the only thing that will fit on the truck anywhere. the whelen amp is located under the passenger seat. I found there was a floor hole plug under the seat accessible through a flap of carpet. using that for the power to the horn wiring, it comes out right above the frame and from there the wiring just goes along with the other wiring looms on that side. I plan to get a stock pedal adjustment momentary switch but for now just have a old push button trunk opening switch from a chevy filling in one of the tree blanks on the far left of the dash. the horn is usually a cast aluminum color but I painted it to make it less noticeable. see and hear!
http://www.putfile.com/media.php?n=IM000422