After ordering everything over the last few months and getting help on here and other sites I finally got everything installed. I have some wiring to do still, but all the parts are in. This in installed on my F350. The horns are in the spare tire location. I made a plate to mount the horns to then the plate lets me mount them to the truck. The plate is 1/4inch steel. I welded bolts to the plate to make the whole thing harder to be taken. I also used tamper resistant bolts on the horn mount and for the plate to the truck I used round bolts that are tightened by 3/8 drive ratchet on the inside of the bolt.
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I have 3/4 air line going to the horn. I used air dryers on both inlets from the compressors to the tank. I put connections for air line at the front and back of the truck. The tank is 7.5 gallons.
Congrats on a pretty cool looking & well thought out install. Great photos & even given me an idea where to put my PCL connector to!