what do i hook a tach to on a 12valve?

[jeremy153624]

i got a 1990 f350 with a 1994 12valve in it. i was wondering how to hook a tach to it. i have a factory tach on the dash is there anyway i could use it? thanks

 

[honestcharlie56]

you should have a ESS on the Dampner...at the front of the motor.