j/p. ok here is waht you do. plug everyhting back in without the clear plastic on. tunr the car to acc, wait liek 30 seconds, then put the tach and spedo at 0. now pace a freind to see if its off by any. After takign the needles off 2 consecutive times my spedo was off by 10 adn rpm was off by 5. so for rpms i jsut drove the car aroudn for a bit then let it idle and put the needle at what it normally idles at, leik 700. For the spedo i paced my dad doign 30 and put the needle at 30 now all is good.
1 thing to make sure, do not push the needles around thwn you put them on. that cna mess it up. and if you start ur car and ur neelds go all the way around, tunr it off, and push the needle all the way around, then all the way back. so it knows it going int he right direction.
any questions feel free to pm me