i bought an after market tach for my car i hooked up my light and groung but where would i hook up my green wire to? my car dosent have an ignition coil and i dont want to cut up my ECM.

Pretty sure it has to go to the ECU.

yep, gotta go to the computer.

oh but your car DOES have an ignition coil

or you could tap the signal wire to your existing tachometer.......

car never had a tach thats why i bought one?
Dont all standards come stock with tachs tho?

no.

not the new sentra xe......if you dont already have a tach then go to the ecu, but by saying aftermarket i thought you were replacing the one you had