Hey TakemuraShuu, I know this is a really old thread, but I came across this when I was struggle trying to do the same. I just wanted to throw this out there, if someone else goes down this path. This post was helpful.
I was able to get the spark to work. I put the signal to post "W" and grounded "G". And just tidbits for disclosure, Im using a 0v type 4-pin HEI module, and I'm running things on the bench with Speeduino. Just something to consider.