The following Application Note details the procedures for connecting a Sensus High-Speed Pickup (Pulse) Register to an EtherMeter; and it also describes an example of modified Setup Menu parameters for the High-Speed Pickup:
https://scadametrics.com/PDF/App_Note_014.pdf
Note that the Sensus High-Speed Pickup requires an external +12VDC power supply. In this application, we recommend using a single +12VDC power supply to power BOTH the EtherMeter and High-Speed Pickup.