when i drive my car around, my stock si tachometer gets up to about 3k and then jumps around ramdomly... i havent changed anything since it used to work (which was last night) i was just wondering if anyone has had this problem before? or how to figure out what is wrong.

thank you

 

Ive had this prob before, my ground wire (black one) was ripped/dissconnected. It would also like go back down slow or fast, do all sorts of weird stuff.

 

Also check your igniter. Or maybe the igniter grounds. Thats what happened to mine. A new igniter fixed everything

 

hmmm, well i unhooked everything and carfully checked to see if any wires were torn or unhooked. everything looked fine. so i hooked it back up and it worked! good poo.

thanks for your help any way