no, but NSS feeds the ground for seatbelts warning relay and buzzer, although somebody told me the 72 was quite diff on that, not being the NSS but emergency brake signal 73 diagram shows the NSS source for that ( same to 74 interlock ). Haven't checked really a 72 diagram to confirm that but even will work, I know 72 tranny harness gets the NSS ground signal into the cab like 73 and 74