i am looking to get some air horns...

i figure i will need the following:
compressor- i'm looking into the MV50, that is also good for airing up tires.
tank- 5 gallon in the bed or something
horns of course... ebay has some and jcwhitney also...

but what will turn the air compressor off after it reaches 100 some psi? do i need to get a pressure switch and all that jaz, along with a electronic solinoid to activate the air to the horns?

any simplified way to do this, and where do you mount the horns and compressor?

thanks, erick

edit:

does the MV50 shut off when the maximum pressure is reached? if so then no pressure switch being needed would be very helpful..

 

http://www.hornblasters.com

Best complete kits available on the market IMO