I did the WAV Trigger in my 1956 Williams Crossfire.
It was a lot of work.
I had to add a relay bank to interface with the 50 volt signals to each target.
I was very pleased with the results though I was never able to completely eliminate the ghost trips.
I set up my game to run either the bells that it came with or digital sound via the WAV-Trigger.
It is cool that you can choose your own sounds when you set it up.