[bestgenman]

Larry, on Greenie there were two mag pickups at the out put of the tranny.  Mounted outboard and picking up their signal from a toothed wheel on the tailshaft.  since Greenie was an 1989 and had a 741, i thought Newell might have used the same setup.

One MPU was for the speedo, and the other was used by the cruise control for the Silver 92.   Somebody has mentioned the gap previously and testing is not difficult but you'd need a meter that reads frequency.  Not common for MPUs to fail but possible.  

Happy 80th