ok i did a dohc swap in my 97 about a year ago now before i swaped the motor and tranny the tach worked in my bar and the donor car when i swaped it i swaped motor and tranny and computer never seperated motor and trans and put the tach from the donor in mine to keep track of mileage but now the tach does not work and i am wondering why i never disconnected any of the wiring harness off the motor only the plug from the computer and plugs from under the fuze box can anyone tell me how yo get the tach to work i would like to have it working before i swap my 5spd in thanks alot and hope someone can acually help me this time