Yes the Clark board does use the trigger switch for sound. I would check the make sure it is in the correct firing mode. Have you checked the manual on his site yet first? He goes through a pretty decent install. I also made a video on how to install an airsoft one in one of our tanks here:
https://www.youtube.com/watch?v=oOE0-61Mzhs I did have to change the wiring a bit, but it wasn't too difficult. Have you tried contacting the vendor you purchased it from and asking? (sorry I always ask this, but they should be able to help if they sell the product)