I haven't read through all this but my s2 running a p8 reads in half revolutions with coil pack waisted spark as ur saying !! ive got a bit of wiring at home that cures it don't no where it goes presume on back of the clocks but has instructions with it iff any use to u ??? send me a pm as I don't look at my revs :O its made to make it read correct
im not going to use it as cant be bothered to unscrew the clocks lol