My Froude dyno use a 60tooth wheel that look like an ABR ring and a inductive sendor that give  Sinus Voltage signal.

Wor the YourDyno RPM input I will use an converter that give a 5V square signal. There was two outputs one 1:1 one 10:1

Wich I shold use ? Dyno max are 16000 but I will never go over 9000 RPM