i ended up bolting mine to one of the holes for the a/c bracket (i don't have a/c). i never did calibrate it (although it does come pre-set for the engine configuration so it is as close as can be expected without calibration), as I never went fuel injection. it does indicate knock at high rpm, which is to be expected, it isn't really a knock, just normal engine noise. if i recall right, MS has a cut off in the software to ignore a knock sensor past a specific rpm for this issue. i basically treat it as an idiot light as I am running a carburetor.
edit:
the link where i bought mine: http://www.viatrack.ca/