I have a Anson turbo systeme Engine knock meter kit whit knock gauge on my boat .

I have a knock sensor on my bloc plug to tje white wire goes to the knock meter box . Y have a red wire goes to the gauge and to the 12V but i have a yellow wire not connected .

did someone have a wirring diagram of this kit ? And how can i test for check if it’s the box and gauge work ?

This the same?
http://www.jandssafeguard.com/Universal/UniInstall.html

Btw, there are a good amt of threads on your, and others, knock meters on this forum. Google is better search on OSO threads, then OSO’s search function.