sorry for joining u guys late LOL....92maxima92 i read the whole thread but i might have missed this.....did u try to retrieve any trouble codes from ECU?
http://pages.cthome.net/bbachinsky/nissan_ecm_codes.htm
it could be ur coils as TACHO gets its signal from coils and ECU at the same time....there COULD be a possibility of the ECU being BAD....but before i would say check ur coils for cracks as Greeny said....i ma try to get pics of crack coils as i had them and cant find them now
edit: oh here...r they worse than these?
ya i did realize that they were huge so i resized them and i think u deleted them again accidentally lol so i added them again lol
