The tach transducer wire was spiral-wrapped onto itself and other wires for stability. The screw holding two Adel clamps with wires was loosened. The nut was removed and the ring terminal for the transducer ground was added. The primer was removed with a Scotchbrite pad before the terminal was added. The screw and nut were tightened.
The tach transducer wire was attached to the bus bar behind the EMS CB