I've been looking at adding a knock sensor to my G4+ extreme, then saw this: G4 KnockLink is a self-calibrating, visual knock warning tool.

The G4 KnockLink is the only detonation warning device on the market that requires no setup

Has anyone tried it? Seems too good to be true!

Seems to be a standalone device with no output to retard the timing via the ecu - that would be a shame

its for my Rx7 triple rotor, would be nice to have some knock protection