Call them, you may have a faulty rectifier.
I just replaced my stator and rectifier with CDI units, all is lovely along with my tach.
Call and ask for tech assistance.
In their instructions and troubleshooting paper included with the units, they explain in detail how to check your units with a known good meter and how to ohm it out. Are you finding any shorts or anything out of range with those tests?
On the sheets, CDI highly recommends a qualified mechanic install the units. If you do not feel confident with your install, maybe you should consult one. Good luck with your issue.
Troubleshoot your old unit, too. With mine, the blue circuit from the stator was open indicating the first phase (Low RPM) had went out. I compared meter readings between the old units and the new units and I felt confident the new units were fine - before the install.