Does anyone know what it is used for and what the calibration might be? it is a ANTY mask for a 454 tbi. I know not a third gen but hoping for a hint from some folks that have a clue. The project a friend is putting a 454 tbi engine out of an 89 suburban in a 56 chevy truck and the speed sensor is a problem.. So the question does it matter only a tiny bit or do we have a big problem. Any help is really appeciated.
Dave

 

2002 pulses per mile (PPM), digital input to ECM.

RBob.

 

Do you know what does not work if it is missing?? Dave