I think a lot of the "marine" tachs, especially one's for outboards work similar to the tiny tach. But if you have a volt meter, set it to ac and see what that wire your talking about reads. If it fluctuates when rpm's change, I'd think it would work. Hopefully the tach has some different settings so you can get it tuned to read whatever voltage the kohler uses. brlcla posted up one a while back that is backlit and works like the tiny tach. It would work for sure. Same company makes one for oil temp that I've been looking into...