i have a d16z6 and i got a 5" autometer tach n installed it. everybody worked out fine then a couple days lata the afta market tach needle started jumping n i didnt kno wat was goin on. like the car will be at 3500rpms and the needle bounces from 4 n 5 until i rev pass 5. the tach reads accurately till 3000 afta it just jumps. so i unhooked it n now my stock gauge cluster tach does it also. if anybody has this problem n solved it please help. it doesnt really effect performance or the way it runs just weird y it does that. thanx ahead of time.