Our first step was to mount the air tank and Viair compressor. Because of the large size of the air tank, we opted to mount it in the bed. After we marked and drilled our holes, we used the supplied 3/8-inch bolts to secure it. We then mounted the Viair 400C compressor and inserted the airline into the side of the tank. As you can see, we also filled the empty ports with the supplied fittings.
HornBlasters Train Horn Kit Installation - Attention Getter