Ok, so i would like to buy a good knock light but they're like $110, but i cant afford it. So i think im going to make one based on one a guy made for a AEM stand alone unit. Heres how it works, since a knock happens so fast (5 milliseconds sometimes) that wouldnt be enough to time to even light a filliment bulb if you had one wired to the knock sensor (like your knock light) but it would light a LED however for the 5ms it would be lit you might not see it. So, they used a DEI 611T latch/timer relay switch. Which when given a activation pulse (would be the knock sensor signal to the ecu {is that a neg. signal, im thinking it is?}) then would hold open the power to its output wires (which will be hooked to a LED) for an amount of time (can be set from 1-100 seconds or precisely between 0-1 seconds). Do you think this will work, i think so. which means i could make one for like $20. Secondly do you happen to know what the voltage from the knock sensor would be to be considered a knock? Because im thinking the knock sensor voltage may vary as it not just a on/off switch, its built somewhat like a map i think? He set his .8v. He also had his AEM trigger the activation wire for the 611T when the AEM seen .8v on its channel for that. I dont have that, so i would have to figure out a way to send a signal to the activation wire on the 611T. Could this be done with a transistor (i could be thinking of the wrong electrical component on that transistor thing) ? Any help is appreciated, and if i get it working ill post a write up on it for you guys!