KnockLite by Turbo XS.

Turboxs knocklite knock noise detection comparison

TurboXS KnockLite Knock Detection System

Detonation or "knocking" can destroy an engine in no time flat leaving you with a repair bill that can cost you thousands of dollars. So how do you KNOW that you are knocking BEFORE it's too late? The TurboXS KnockLite (TM) will detect even minor, inaudible detonation and flash the multicolored LED to alert you to the knock so that you can do something about it before it's too late. The KnockLite is a must-have product for anyone that is modifying their engine for more power. The KnockLite wires into either your factory knock sensor or into separate knock sensor (sold separately) that is mounted to your engine block.
Knocklite is a cheap insurance when you`re tuning and racing your engine, especially on hot days when intake temps get too high!