tach problem. need help!
 

i have a 93 civic lx sedan and when i start the car the rpm guage sits at zero if i slowly rev the engine it sits at zero untill the car is at about 3000 rpm then the needle will jump to over 8000 and sit there ttill i let off gas then it the needle goes straight to zero. and if the needle is at >8k and i signal the needle jumps everytime the blinker turns on and when i use my wipers. can anyone help me please!

http://www.youtube.com/watch?v=_bKK7YVg6Hs

i have a 93 civic lx sedan with a d16y7 motor. obd1 car with obd2 motor.

Had it done this since swap or did it just happen??

dont think so. i bought it from the guy like it is.