another daft question Im afraid,
what is a Knock link for ??

 

If you do a wee search for it mate there is loads of info on here

 

A knocklink is a visual display consisting of LED's to monitor for knock, det, pinking etc.
A separate microphone sits on the block and listens out for det which if detected is shown as an amber or red warning on the knocklink.

http://www.brdevelopments.com/link.html
http://www.jap-innovations.fsnet.co....ectronics.html