Link ECU Knocklink G4 #G4KNL (No Sensor)KnockLink is a self calibrating, visual knock warning tool. The KnockLink is designed for tuning, street and race use. Will require a knock sensor to function (sold separately) or you can purchase the KnockLink Kit that includes the Knock Sensor and Loom. The G4 KnockLink is the only detonation warning device on the market that requires no setup. Other systems require time consuming gain, frequency and noise settings to be adjusted. Without proper