Just get a wideband o2 gauge.
good pointare trying to use it with your excisiting knock sensors?
if ford uses piezo knock sensors like everone else, the just sample the signal off stockers.
edit: these engines "run with a little ignition ping" says the ford manual.. might give false positives all the time unless the desensitizing is within the ecm software.
remember also, by the time your eye actually picks up on knock from a datalog or knock sensor monitor, the knock has probably occured a compression stroke or two ago.. so lifting is actually useless at that point.
How does it know how much the ecu it retarding the timing? There are complex algorithms that "decrypt" the knock sensor signal in the ecu. Your knock sensor might do that. I run a turbo XS knock light, with a universal bosch wideband knock sensor, and it works ok, but it could be more sensitive. (there is a rough calibration procedure so it can learn the engine signature) I may move the sensor around a bit. You can log knock with a datalogger and see how much timing is being pulled. For a max performance tune it should be pulling a degree or 2 at WOT, so your light would be on all the time, even when its totally safe. Once the ecu pegs out on the timing it can pull, then you will have some problems!!I have a wideband.....but the knock detector picks up off the knock sensor, each degree of knock retard lights up 1 LED